1. home and garden
2. home improvement and repair
3. plumbing

Engineering Data and
Installation Manual
ST MODELS SPLIT SYSTEM WATER-TO-AIR HEAT PUMPS
REVISION: 05 AUG 2014G
*20D082-06NN*
20D082-06NN
Table of Contents:
Section 1: Model Nomenclature
Model Nomenclature.................................................................................................................4 - 5
Section 2: AHRI Performance Data
Ground Loop & Open Loop............................................................................................................6
Section 3: Physical & Dimensional Data
Compressor Section Data., MPD Air Handlers, ACD/MCD Cased/Uncased Coils.............7 - 9
Section 4: Electrical Data
Unit Electrical Data.................................................................................................................10 - 11
Section 5: Specification Glossary & Calculations
Glossary & Flow Rate Calculations.......................................................................................12 - 13
Section 6 Performance Data
Unit Performance Data..........................................................................................................14 - 19
Section 7: Installation Introduction
Introduction, Pre-Installation, Components.........................................................................20 - 21
Section 8: Installation Considerations
Installation Considerations............................................................................................................22
Section 9: Installation
Unit Placement...............................................................................................................................23
A: Ductwork Installation..........................................................................................................24 - 25
B: Filter Drier Installation.................................................................................................................26
C: Line Set Installation / Charging........................................................................................27 - 37
Section 10: Unit Piping Installation
Interior Piping, Water Quality.................................................................................................38 - 42
Section 11: Antifreeze
Overview.........................................................................................................................................43
Anitfreeze Charging...............................................................................................................44 - 45
Section 12: Desuperheater Installation
Installation................................................................................................................................46 - 48
Section 13: Controls
Controls & Wiring Diagrams...................................................................................................49 - 59
Section 14: Accessories
APSMA Pump Sharing Module......................................................................................................60
Section 15: Troubleshooting
Troubleshooting.......................................................................................................................61 - 70
Section 16: Forms
Troubleshooting, Unit Start-Up, Warranty..............................................................................71 - 70
Revision Table.................................................................................................................................78
Section 1a: Model Nomenclature
Air Handlers
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Section 1d: Air Handler/”A” Coil Model Nomenclature
Cased “A” Coils
“A” Coils
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Section 2: AHRI Performance Data
Ground Loop Heat Pump
MODEL
ST024
ST036
ST048
ST060
ST072
CAPACITY
Full Load
Part Load
Full Load
Part Load
Full Load
Part Load
Full Load
Part Load
Full Load
Part Load
HEATING
Btu/hr
COP
18,600
3.4
14,400
3.8
28,400
3.7
22,600
4.2
35,900
3.8
27,900
4.2
44,200
3.5
34,700
3.9
51,200
3.4
41,500
3.7
COOLING
Btu/hr
EER
24,900
16.1
18,300
22.1
38,000
16.5
28,900
23.9
48,600
18.7
39,400
26.4
62,200
16.8
47,400
22.5
67,800
15.9
53,700
22.1
Note:
Rated in accordance with ISO Standard 13256-1 which includes Pump Penalties.
Heating capacities based on 68.0°F DB, 59.0°F WB entering air temperature.
Cooling capacities based on 80.6°F DB, 66.2°F WB entering air temperature.
Entering water temperatures Full Load: 32°F heating / 77°F cooling.
Entering water temperatures Part Load: 41°F heating / 68°F cooling.
Ground Water Heat Pump
MODEL
ST024
ST036
ST048
ST060
ST072
CAPACITY
Full Load
Part Load
Full Load
Part Load
Full Load
Part Load
Full Load
Part Load
Full Load
Part Load
HEATING
Btu/hr
COP
23,500
4.2
16,200
4.1
36,400
4.4
25,600
4.8
44,600
4.5
31,800
4.9
55,400
4.1
39,400
4.4
63,700
4.1
46,700
4.1
COOLING
Btu/hr
EER
26,900
20.8
19,100
26.8
40,600
21.9
30,100
28.8
53,200
24.0
40,900
30.5
65,900
21.0
49,100
26.3
71,700
20.2
55,600
26.0
Note:
Rated in accordance with ISO Standard 13256-1 which includes Pump Penalties.
Heating capacities based on 68.0°F DB, 59.0°F WB entering air temperature.
Cooling capacities based on 80.6°F DB, 66.2°F WB entering air temperature.
Entering water temperatures: 50°F heating / 59°F cooling.
*ST072 with ACD060C does not qualify for ENERGY STAR on Ground Water Ratings
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Section 3a: Unit Dimensional and Physical Data
B
C
Suction
Liquid
Sweat Connections
A
Source Water In
Source Water Out
Desuperheater Out
Desuperheater In
Refrigeration
Connection
A
B
C
Liquid
Suction
IN
OUT
IN
OUT
Unit
Weight
(Pounds)
024
18.8
22.0
25.5
3/8”
7/8”
1.0”
1.0”
3/4”
3/4”
180
036
21.8
26.0
30.5
3/8”
7/8”
1.0”
1.0”
3/4”
3/4”
225
048
22.8
26.0
30.5
3/8”
7/8”
1.0”
1.0”
3/4”
3/4”
270
060
22.8
26.0
30.5
1/2”
1-1/8”
1.0”
1.0”
3/4”
3/4”
270
072
22.8
28.0
30.5
1/2”
1-1/8”
1.0”
1.0”
3/4”
3/4”
295
Model
Dimensional Data
Water Loop*
Desuperheater
* Water loop fittings are Double O-Ring fittings on GeoComfort residential units only. Hydron Module, TETCO, and Commercial
voltage units have threaded fittings.
AHRI Air Handler and “A” Coil Matches
Compressor
Section
Air Handler Match
“A” Coil Match
024
MPD024A
ACD024B
036
MPD036A
ACD036B
048
MPD060B
ACD060C
060
MPD060B
ACD060C
072
MPD072A
ACD060C
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⚠ NOTICE ⚠
WHEN MATCHING AN ST048 OR ST060
WITH AN MPD060B, REFER TO THE CFM
CHART ON PAGE 56 FOR THE PROPER
AIRFLOW JUMPER SETTINGS.
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Section 3b: Air Handler Dimensional and Physical Data
Shown with
optional
field-installed
electric heat
Line Set
Connection
Alternate
Drain
(Horizontal)
Primary Drain
(Horizontal)
Alternate
Drain
(Vertical)
Primary Drain
(Vertical)
Model
MPD024A
Size
(tons)
All Dimensions in Inches
A
B
C
D
E
F
G
H
J
K
L
M
N
P
R
2
17 5/8
43
21
15 5/8
12 1/2
13 1/2
11
6 3/4
16 3/4
14
11
10 3/4
2
1 1/2
5
MPD036A
3
21 1/8
48
21
19
12 1/2
14 1/2
13
6 3/4
20
17
12 3/4
10 1/4
2 1/4
4 3/8
5
MPD060B
4-5
24 5/8
58 7/8
21 3/4
22 1/4
14 1/4
19 3/4
17 1/4
6 3/4
26
23
16 3/4
14 3/8
4 1/4
4 3/8
4 1/2
MPD072A
6
24 5/8
58 7/8
21 3/4
22 1/4
14 1/4
19 3/4
17 1/4
6 3/4
26
23
16 3/4
14 3/8
4 1/4
4 3/8
4 1/2
Return Air Opening
Model
Width
Depth
MPD024A
15 1/2
19 3/4
MPD036A
19 3/4
19 3/4
MPD060B
23 1/2
20 3/4
MPD072A
23 1/2
20 3/4
Shown with
optional
field-installed
electric heat
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Section 3c: “A” Coil Dimensional and Physical Data
C
B
A
Size
(tons)
Model
ACD024B
ACD036B
ACD060C
A
16 5/8
19 5/8
23 3/4
2
3
4-6
All Dimensions in Inches
C
Liquid
14 1/2
3/8
18 1/2
3/8
27 7/8
3/8
B
19
19
20 1/2
Suction
3/4
3/4
7/8
All Dimensions In Inches (nominal)
Model
Size
(Tons)
A
B
C
D
E
F
024
2
17.5
21.0
20.0
15.2
19.2
2.1
G
H
4.1 1.8
I
J
2.3
11.1
K
8.5
L
13.8
M
9.2
N
11.0
O
P
Q
Weight
(lbs)
3.3
.88
.38
45
036
3
21.0
21.0
24.0
18.7
19.2
2.2
4.3 1.8
2.3
12.9
10.6 15.7
11.9
14.2
3.3
.88
.38
50
060
5
24.5
22.0
34.0
22.0
19.9
2.2
4.2 1.9
2.3
17.3
12.8 19.8
24.8
26.8
3.3
.88
.38
72
NOTES:
1. The AC series coils are designed as high efficiency “A” coils to be installed
on new and existing indoor furnaces. These coils may be used in upflow and
downflow applications.
2. Coils are ETL and CSA approved.
3. Primary and secondary drain connections are available on the LH or RH side
of the drain pan, and are 3/4” FPT. Center line of drains located from pan
corner, 1 1/2” for primary and 3 1/2” for secondary.
4. Drain pan is injection molded high temperature UL approved plastic.
5. All coils are equipped with factory-installed TXV, 15% bleed type.
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⚠ WARNING ⚠
IF USING A DUAL FUEL
APPLICATION, “A” COIL MUST BE
INSTALLED ON THE OUTLET OF THE
FURNACE. INSTALLATION ON THE
RETURN COULD CAUSE FURNACE
HEAT EXCHANGER FAILURE, AND
MAY VOID FURNACE WARRANTY.
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Section 4a: Unit Electrical Data
Model
024
036
048
060
072
60Hz Power
Compressor
Volts
Phase
LRA
RLA
HWG
Pump
FLA
0
208/230
1
58.3
11.7
N/A
1
208/230
1
58.3
11.7
0.5
4.0
16.2
19.1
30
14
39
2
208/230
3
55.4
6.5
N/A
N/A
6.5
8.1
15
14
99
0
208/230
1
83.0
15.3
N/A
N/A
15.3
19.1
30
14
42
1
208/230
1
83.0
15.3
0.5
4.0
19.8
23.6
35
12
50
2
208/230
3
73.0
11.6
N/A
N/A
11.6
14.5
25
14
55
0
208/230
1
104.0
21.2
N/A
N/A
21.2
26.5
45
10
78
1
208/230
1
104.0
21.2
0.5
5.5
27.2
32.5
50
8
94
2
208/230
3
83.1
14.0
N/A
N/A
14.0
17.5
30
14
46
0
208/230
1
152.9
27.1
N/A
N/A
27.1
33.9
60
8
94
1
208/230
1
152.9
27.1
0.5
5.5
33.1
39.9
60
8
77
2
208/230
3
110.0
16.5
N/A
N/A
16.5
20.6
35
12
60
0
208/230
1
179.2
29.7
N/A
N/A
29.7
37.1
60
8
86
Voltage
Code
Ext Loop
Pump
FLA*
Total
Unit
FLA
Min
Circuit
AMPS
Max
Fuse
HACR
Min
AWG
Max
Ft
N/A
11.7
14.6
25
14
55
1
208/230
1
179.2
29.7
0.5
5.5
35.7
43.1
70
6
114
2
208/230
3
136.0
17.6
N/A
N/A
17.6
22.0
40
12
56
Notes:
1. All line and low voltage wiring must adhere to the National Electrical Code and Local Codes, whichever is the most stringent.
2. Wire length based on a one way measurement with a 2% voltage drop.
3. Wire size based on 60°C copper conductor and minimum circuit ampacity.
3. All fuses class RK-5
4. Min/Max Voltage: 208/230/60/1 = 187/252, 208/230/60/3 = 187/252
* The external loop pump FLA is based on a maximum of three UP26-116F-230V pumps (1/2hp) for 048 - 062 and two pumps for 024 - 038
NOTE: Proper Power Supply Evaluation
When any compressor bearing unit is connected to a weak power supply, starting current will generate a significant “sag” in the
voltage which reduces the starting torque of the compressor motor and increases the start time. This will influence the rest of the
electrical system in the building by lowering the voltage to the lights. This momentary low voltage causes “light dimming”. The total
electrical system should be evaluated with an electrician and HVAC technician. The evaluation should include all connections,
sizes of wires, and size of the distribution panel between the unit and the utility’s connection. The transformer connection and
sizing should be evaluated by the electric utility provider.
⚠ CAUTION ⚠
CHECK COMPRESSOR AMP DRAW TO
VERIFY COMPRESSOR ROTATION ON THREE
PHASE UNITS. COMPARE AGAINST UNIT
ELECTRICAL TABLES. REVERSE ROTATION
RESULTS IN HIGHER SOUND LEVELS,
LOWER AMP DRAW, AND INCREASED
COMPRESSOR WEAR. THE COMPRESSOR
INTERNAL OVERLOAD WILL TRIP AFTER A
SHORT PERIOD OF OPERATION.
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Section 4a: Unit Electrical Data
Section 4b: Air Handler Section Unit Electrical Data
Model
60 HZ Power
Volts
Phase
MPD024A
208/230
1
MPD036A
208/230
1
MPD060B
MPD072A
208/230
208/230
1
1
Field-Installed Elect Heat
# Circuits
kW
1
None
0
1
10
None
0
1
10
Motor Amps
/ HP
2.8 / 0.33
4.3 / 0.50
Minimum
Circuit
Ampacity2
Maximum
Fuse
Size2
3.5
10
54.9
60
5.4
10
56.4
60
2
15
30.3 / 56.4
40 / 70
None
0
8.5
15
1
10
2
15
6.8 / 1.0
58.9
70
32.8 / 58.9
40 / 70
2
20
58.9 / 58.9
70 / 70
None
0
8.5
15
1
10
2
15
2
20
6.8 / 1.0
58.9
70
32.8 / 58.9
40 / 70
58.9 / 58.9
70 / 70
Notes:
1. Nominal kW at 240V. Derate 25% for 208V.
2. Units with field-installed electric heat 15kW and larger have two circuits. Data shown as “XX/XX” refers to
circuit 1 before the “/” and circuit 2 after the “/”
3. Always refer to unit nameplate data prior to installation
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Section 5: Specification Glossary & Calculations
Glossary of Terms
CFM = Airflow, Cubic Feet/Minute
HR = Total Heat Of Rejection, Btu/hr
COP = Coefficient of Performance = BTU Output / BTU Input
KW = Total Power Unit Input, Kilowatts
DH = Desuperheater Capacity, Btu/hr
LAT = Leaving Air Temperature, Fahrenheit
EAT = Entering Air Temperature, Fahrenheit (Dry Bulb/Wet Bulb)
LC = Latent Cooling Capacity, Btu/hr
EER = Energy Efficiency Ratio = BTU output/Watts input
SC = Sensible Cooling Capacity, Btu/hr
EWT = Entering Source Water Temperature, Fahrenheit
LWT = Leaving Source Water Temperature, Fahrenheit
ELT = Entering Load Water Temperature, Fahrenheit
LLT = Leaving Load Water Temperature, Fahrenheit
GPM = Water Flow, Gallons Per Minute
TC = Total Cooling Capacity, Btu/hr
HC = Total Heating Capacity, Btu/hr
WPD = Water Pressure Drop, PSI & Feet of Water
HE = Total Heat Of Extraction, Btu/hr
Heating & Cooling Calculations
Heating
LAT = EAT +
HC
CFM x 1.08
LWT = EWT -
HE
GPM x 500
Cooling
LAT (DB) = EAT (DB) LWT = EWT +
SC
CFM x 1.08
HR
GPM x 500
LC = TC - SC
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Section 5: Water Flow Selection
Water Flow Selection
Proper flow rate is crucial for reliable operation of geothermal heat
pumps. The performance data shows three flow rates for each entering
water temperature (EWT column). The general “rule of thumb” when
selecting flow rates is the following:
Top flow rate: Open loop systems (1.5 to 2.0 gpm per ton)
Middle flow rate: Minimum closed loop system flow rate
(2.25 to 2.50 gpm/ton)
Bottom flow rate: Nominal (optimum) closed loop system flow rate
(3.0 gpm/ton)
Although the “rule of thumb” is adequate in most areas of North
America, it is important to consider the application type before applying
this “rule of thumb.” Antifreeze is generally required for all closed loop
(geothermal) applications. Extreme Southern U.S. locations are the
only exception. Open loop (well water) systems cannot use antifreeze,
and must have enough flow rate in order to avoid freezing conditions at
the Leaving Source Water Temperature (LWT) connection.
Calculations must be made for all systems without antifreeze to determine if the top flow rate is adequate to prevent LWT at or near freezing
conditions. The following steps should taken in making this calculation:
Determine minimum EWT based upon your geographical area.
Go to the performance data table for the heat pump model selected and
look up the the Heat of Extraction (HE) at the “rule of thumb” water flow
rate (GPM) and at the design Entering Air Temperature (EAT).
Calculate the temperature difference (TD) based upon the HE and GPM
of the model (step 4).
TD = HE / (GPM x 500).
Calculate the LWT (step 6).
LWT = EWT - TD.
If the LWT is below 35-38°F, there is potential for freezing conditions if
the flow rate or water temperature is less than ideal conditions, and the
flow rate must be increased.
Example 1:
EWT = 50°F.
3-Ton Model, high capacity. Flow rate = 5 GPM. HE = 26,900 Btuh.
TD = 26,900 / (5 x 500) = 10.8°F
LWT = 50 - 10.8 = 39.2°F
Water flow rate should be adequate under these conditions.
Example 2:
EWT = 40°F.
3-Ton Model, high capacity. Flow rate = 5 GPM. HE = 23,200 Btuh.
TD = 23,200 / (5 x 500) = 9.3°F
LWT = 40 - 9.3 = 30.7°F
Water flow rate must be increased.
Performance Data Notes
1. Capacity data is based upon 15% (by volume) methanol antifreeze solution.
2. Desuperheater capacity is based upon 0.4 GPM Flow per nominal ton at 90°F entering hot water temperature.
3. Interpolation between above categories is permissible; extrapolation is not.
4. See Flow Rate Selection above for proper application.
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GST024C1CB
Load Operation
Section
6b:FullModel
024 with MPD024A Performance Data: 2.0 Ton,
900 Nominal CFM Heating; 950 Nominal CFM Cooling
Full Load, 900 CFM Cooling / 900 CFM Heating
EWT Flow
°F GPM
25
30
40
50
60
70
80
90
100
110
6.0
5.2
Cooling
COP
DH Aiflow
TC
SC
HR
EER
DH
S/T
kW
Btuh/W MBtuh
W/W MBtuh CFM MBtuh MBtuh
MBtuh
1.63 3.06 2.3
1.51 3.30 2.3
1.60 3.37 2.5
1.48 3.64 2.5
1.61 3.42 2.5
1.50 3.67 2.5
1.63 3.42 2.5
Operation Not Recommended
1.51 3.69 2.5
1.66 3.67 2.8
1.54 3.96 2.8
1.68 3.71 2.8
1.56 4.00 2.8
1.70 3.71 2.9
1.58 3.99 3.0
1.73 3.93 3.1
950
33.4
20.1
0.60
38.1 1.37 24.4 2.4
1.61 4.22 3.1
925
32.8
20.1
0.61
37.5 1.39 23.6 2.4
1.75 3.97 3.1
950
33.6
19.2
0.57
38.1 1.33 25.3 2.1
1.62 4.29 3.1
925
33.0
19.2
0.58
37.6 1.35 24.4 2.1
1.76 3.98 3.2
950
33.8
19.1
0.57
38.3 1.31 25.8 2.0
1.64 4.27 3.2
925
33.2
19.1
0.58
37.7 1.33 25.0 2.0
1.78 4.30 3.5
950
32.6
20.0
0.61
37.7 1.50 21.7 3.0
1.65 4.63 3.5
925
32.0
20.0
0.63
37.2 1.51 21.2 3.0
1.80 4.33 3.5
950
32.8
19.1
0.58
37.8 1.46 22.5 2.7
1.67 4.67 3.6
925
32.2
19.1
0.59
37.2 1.47 21.9 2.7
1.82 4.33 3.6
950
33.0
19.0
0.58
37.9 1.43 23.1 2.5
1.69 4.66 3.8
925
32.4
19.0
0.59
37.3 1.45 22.3 2.5
1.84 4.60 3.8
950
31.6
19.8
0.63
37.2 1.65 19.2 3.5
1.71 4.95 3.8
925
31.1
19.8
0.64
36.8 1.67 18.6 3.5
1.86 4.66 3.9
950
31.9
18.9
0.59
37.4 1.61 19.8 3.2
1.73 5.01 3.9
925
31.3
18.9
0.60
36.9 1.63 19.2 3.2
1.88 4.64 4.0
950
32.0
18.8
0.59
37.4 1.58 20.3 3.0
1.74 5.02 4.0
925
31.4
18.8
0.60
36.9 1.60 19.6 3.0
1.93 4.75 4.1
950
30.4
19.2
0.63
36.5 1.80 16.9 4.0
1.79 5.12 4.2
925
29.8
19.2
0.64
36.0 1.83 16.3 4.0
1.95 4.81 4.3
950
30.6
18.3
0.60
36.6 1.76 17.4 3.6
1.81 5.18 4.3
925
30.1
18.3
0.61
36.2 1.78 16.9 3.6
1.97 4.80 4.3
950
30.8
18.2
0.59
36.7 1.73 17.8 3.5
1.83 5.17 4.4
925
30.2
18.2
0.60
36.2 1.75 17.3 3.5
2.01 4.90 4.4
950
28.9
18.4
0.64
35.8 2.03 14.2 4.4
1.87 5.26 4.4
925
28.3
18.4
0.65
35.3 2.05 13.8 4.4
2.03 4.97 4.6
950
29.1
17.6
0.60
35.8 1.97 14.8 4.0
1.89 5.33 4.6
925
28.5
17.6
0.62
35.3 2.00 14.3 4.0
2.06 4.94 4.6
950
29.2
17.5
0.60
35.8 1.94 15.1 3.9
1.91 5.32 4.6
925
28.7
17.5
0.61
35.4 1.96 14.6 3.9
950
27.1
17.9
0.66
35.2 2.36 11.5 5.0
925
26.6
17.9
0.67
34.8 2.39 11.1 5.0
950
27.3
17.0
0.62
35.1 2.30 11.9 4.5
925
26.8
17.0
0.63
34.7 2.32 11.6 4.5
950
27.5
17.0
0.62
35.2 2.26 12.2 4.4
925
26.9
17.0
0.63
34.7 2.28 11.8 4.4
Operation Not Recommended
950
25.3
17.3
0.68
34.6 2.72 9.3
5.5
925
24.8
17.3
0.70
34.2 2.75 9.0
5.5
950
25.4
16.5
0.65
34.4 2.65 9.6
5.0
925
25.0
16.5
0.66
34.1 2.68 9.3
5.0
950
25.6
16.4
0.64
34.5 2.60 9.8
4.8
925
25.1
16.4
0.65
34.1 2.63 9.5
4.8
Heating
Aiflow
HC
HE
LAT
CFM MBtuh MBtuh
°F
900
17.0
11.4
87.5
12.1
975
17.0
11.8
86.1
900
18.4
12.9
88.9
5.9
975
18.4
13.3
87.5
900
18.8
13.3
89.3
8.4
975
18.8
13.7
87.9
900
19.0
13.4
89.5
11.7
975
19.0
13.8
88.0
900
20.8
15.1
91.4
5.4
975
20.8
15.5
89.8
900
21.3
15.6
91.9
7.7
975
21.3
16.0
90.2
900
21.5
15.7
92.1
10.7
975
21.5
16.1
90.4
900
23.2
17.3
93.9
4.9
975
23.2
17.7
92.0
900
23.7
17.7
94.4
7.1
975
23.7
18.2
92.5
900
23.9
17.9
94.6
9.8
975
23.9
18.3
92.7
900
26.1
20.0
96.9
4.6
975
26.1
20.5
94.8
900
26.6
20.5
97.4
6.5
975
26.6
20.9
95.3
900
26.9
20.7
97.7
9.0
975
26.9
21.1
95.5
900
28.9
22.6
99.7
4.3
975
28.9
23.1
97.4
900
29.6
23.3 100.5
6.1
975
29.6
23.7
98.1
900
29.8
23.4 100.7
8.5
975
29.8
23.9
98.3
900
31.3
24.7 102.2
4.0
975
31.3
25.2
99.7
900
32.0
25.3 102.9
5.7
975
32.0
25.8 100.4
900
32.3
25.6 103.2
8.0
975
32.3
26.1 100.7
900
33.6
26.7 104.6
3.8
975
33.6
27.2 101.9
900
34.4
27.5 105.4
5.4
975
34.4
27.9 102.7
900
34.7
27.7 105.7
7.5
975
34.7
28.2 103.0
WPD
PSI
FT
4.0
2.5
5.0
3.6
6.0
5.0
4.0
2.3
5.0
3.3
6.0
4.6
4.0
2.1
5.0
3.1
6.0
4.2
4.0
2.0
5.0
2.8
6.0
3.9
4.0
1.8
5.0
2.6
6.0
3.7
4.0
1.7
5.0
2.5
6.0
3.4
4.0
1.6
5.0
2.3
6.0
3.2
4.0
1.5
3.6
5.0
2.2
5.1
6.0
3.1
7.0
4.0
1.4
3.3
5.0
2.1
4.8
6.0
2.9
6.6
kW
Heating data based on 70F EAT; Cooling data based on 80/67F EAT. See Correction Factors on page 24 for different conditions.
Notes:
1. Capacity data includes water pumping watts and is based upon 15% (by volume) propylene glycol antifreeze solution.
2. Desuperheater capacity is based upon 0.4 GPM Flow per nominal ton at 90°F entering hot water temperature.
3. Interpolation between above catagories is permissible; extrapolation is not.
4. See Flow Rate Selection on page 7 for proper application.
Enertech Global
14
ST Models, 05 Aug 2014G
GST036C1CB
Load Operation
Section
6d:FullModel
036 with MPD036A Performance Data: 3.0 Ton,
1350 Nominal CFM Heating; 1350 Nominal CFM Cooling
Full Load, 1350 CFM Cooling / 1350 CFM Heating
EWT Flow
°F GPM
25
30
40
50
60
70
80
90
100
110
9.0
WPD
PSI
FT
3.8
8.8
5.0
1.5
3.5
7.0
2.5
5.8
9.0
3.7
8.6
5.0
1.4
3.2
7.0
2.4
5.5
9.0
3.5
8.0
5.0
1.3
3.0
7.0
2.2
5.1
9.0
3.2
7.5
5.0
1.2
2.8
7.0
2.1
4.7
9.0
3.0
7.0
5.0
1.1
2.6
7.0
1.9
4.5
9.0
2.8
6.6
5.0
1.1
2.5
7.0
1.8
4.2
9.0
2.7
6.2
5.0
1.0
2.4
7.0
1.8
4.1
9.0
2.6
6.0
5.0
1.0
2.4
7.0
1.7
4.0
9.0
2.6
5.9
5.0
1.1
2.5
7.0
1.8
4.3
9.0
2.7
6.2
Cooling
COP
DH Aiflow
TC
SC
HR
EER
DH
S/T
kW
Btuh/W MBtuh
W/W MBtuh CFM MBtuh MBtuh
MBtuh
2.50 3.20 3.7
2.42 3.20 3.6
2.50 3.31 3.8
2.42 3.32 3.7
2.51 3.34 3.8
2.43 3.35 3.7
2.53 3.38 3.8
Operation Not Recommended
2.45 3.38 3.7
2.60 3.63 4.2
2.52 3.63 4.2
2.62 3.65 4.3
2.53 3.67 4.3
2.64 3.70 4.3
2.56 3.70 4.5
2.72 3.90 4.7
1350 41.4
29.1
0.70
48.3 2.02 20.5 3.4
2.63 3.91 4.6
1150 41.2
28.3
0.69
47.7 1.90 21.7 3.3
2.73 3.94 4.8
1350 41.7
29.0
0.70
48.6 2.01 20.7 3.2
2.64 3.95 4.7
1150 41.5
28.2
0.68
48.0 1.90 21.8 3.1
2.75 3.98 4.9
1350 41.9
29.0
0.69
48.6 1.96 21.4 3.1
2.66 4.00 4.8
1150 41.7
28.1
0.67
48.0 1.85 22.5 3.0
2.83 4.15 5.2
1350 40.4
28.9
0.72
48.0 2.22 18.2 4.2
2.73 4.17 5.2
1150 40.2
28.0
0.70
47.3 2.09 19.2 4.1
2.84 4.19 5.4
1350 40.7
28.8
0.71
48.3 2.22 18.3 4.0
2.75 4.20 5.4
1150 40.5
27.9
0.69
47.6 2.09 19.4 3.9
2.87 4.24 5.5
1350 40.9
28.7
0.70
48.3 2.16 18.9 3.8
2.77 4.25 5.6
1150 40.7
27.9
0.69
47.7 2.04 20.0 3.7
2.95 4.37 5.8
1350 39.3
28.6
0.73
47.7 2.47 15.9 5.0
2.85 4.39 5.6
1150 39.1
27.7
0.71
47.1 2.33 16.8 4.8
2.96 4.41 6.0
1350 39.5
28.5
0.72
47.9 2.47 16.0 4.8
2.87 4.42 5.8
1150 39.3
27.6
0.70
47.2 2.32 16.9 4.6
2.99 4.47 6.1
1350 39.7
28.4
0.72
47.9 2.40 16.5 4.5
2.89 4.48 5.9
1150 39.5
27.5
0.70
47.2 2.26 17.5 4.4
3.10 4.54 6.3
1350 37.1
27.7
0.75
46.5 2.74 13.5 5.7
2.99 4.57 6.4
1150 36.9
26.9
0.73
45.7 2.58 14.3 5.5
3.11 4.59 6.4
1350 37.3
27.6
0.74
46.6 2.73 13.7 5.4
3.01 4.59 6.5
1150 37.2
26.7
0.72
46.0 2.58 14.4 5.2
3.14 4.64 6.6
1350 37.5
27.5
0.73
46.6 2.66 14.1 5.3
3.04 4.65 6.7
1150 37.3
26.7
0.72
45.9 2.51 14.9 5.1
3.25 4.69 6.9
1350 34.5
26.6
0.77
45.0 3.09 11.2 6.4
3.14 4.71 6.7
1150 34.3
25.8
0.75
44.2 2.91 11.8 6.2
3.26 4.75 7.0
1350 34.8
26.5
0.76
45.3 3.08 11.3 6.0
3.16 4.75 6.8
1150 34.6
25.7
0.74
44.5 2.90 11.9 5.8
3.29 4.80 7.2
1350 34.9
26.4
0.76
45.1 3.00 11.6 5.9
3.19 4.80 7.0
1150 34.7
25.6
0.74
44.3 2.82 12.3 5.7
1350 32.3
25.7
0.80
44.4 3.55 9.1
7.1
1150 32.1
24.9
0.78
43.5 3.35 9.6
6.9
1350 32.5
25.6
0.79
44.6 3.54 9.2
6.7
1150 32.4
24.8
0.77
43.8 3.34 9.7
6.5
1350 32.7
25.5
0.78
44.5 3.45 9.5
6.6
1150 32.5
24.7
0.76
43.6 3.25 10.0 6.4
Operation Not Recommended
1350 30.0
24.7
0.82
43.9 4.06 7.4
7.9
1150 29.8
23.9
0.80
42.9 3.83 7.8
7.6
1350 30.2
24.6
0.81
44.0 4.05 7.5
7.4
1150 30.0
23.8
0.79
43.0 3.82 7.9
7.2
1350 30.3
24.5
0.81
43.8 3.95 7.7
7.2
1150 30.2
23.8
0.79
42.9 3.72 8.1
7.0
Heating
Aiflow
HC
HE
LAT
CFM MBtuh MBtuh
°F
1350 27.3
18.8
88.7
1150 26.4
18.1
91.3
1350 28.2
19.7
89.3
1150 27.4
19.1
92.1
1350 28.6
20.0
89.6
1150 27.8
19.5
92.4
1350 29.2
20.6
90.0
1150 28.3
19.9
92.8
1350 32.2
23.3
92.1
1150 31.2
22.6
95.1
1350 32.6
23.7
92.4
1150 31.7
23.1
95.5
1350 33.3
24.3
92.8
1150 32.3
23.6
96.0
1350 36.2
26.9
94.8
1150 35.1
26.1
98.3
1350 36.7
27.4
95.2
1150 35.6
26.6
98.7
1350 37.4
28.0
95.7
1150 36.3
27.2
99.2
1350 40.1
30.4
97.5
1150 38.9
29.6 101.3
1350 40.6
30.9
97.8
1150 39.4
30.0 101.7
1350 41.5
31.7
98.5
1150 40.2
30.7 102.4
1350 44.0
33.9 100.2
1150 42.7
33.0 104.4
1350 44.6
34.5 100.6
1150 43.3
33.5 104.9
1350 45.6
35.4 101.3
1150 44.2
34.3 105.6
1350 48.0
37.4 102.9
1150 46.6
36.4 107.5
1350 48.7
38.1 103.4
1150 47.2
36.9 108.0
1350 49.7
39.0 104.1
1150 48.2
37.8 108.8
1350 52.0
40.9 105.7
1150 50.5
39.8 110.7
1350 52.8
41.7 106.2
1150 51.2
40.4 111.2
1350 53.9
42.7 107.0
1150 52.3
41.4 112.1
kW
Heating data based on 70F EAT; Cooling data based on 80/67F EAT. See Correction Factors on page 24 for different conditions.
Notes:
1. Capacity data includes water pumping watts and is based upon 15% (by volume) propylene glycol antifreeze solution.
2. Desuperheater capacity is based upon 0.4 GPM Flow per nominal ton at 90°F entering hot water temperature.
3. Interpolation between above catagories is permissible; extrapolation is not.
4. See Flow Rate Selection on page 7 for proper application.
ST Models, 05 Aug 2014G
15
Enertech Global
GST048C1CB
Load Operation
Section
6f:Full
Model
048 with MPD060B Performance Data: 4.0 Ton,
1600 Nominal CFM Heating; 1650 Nominal CFM Cooling
Full Load, 1650 CFM Cooling / 1600 CFM Heating
EWT Flow
°F GPM
25
30
40
50
60
70
80
90
100
110
WPD
PSI
FT
12.0
7.1
16.4
7.0
2.8
6.4
9.0
4.2
9.7
12.0
6.9
15.9
7.0
2.6
6.0
9.0
3.9
9.1
12.0
6.4
14.9
7.0
2.4
5.6
9.0
3.7
8.5
12.0
6.0
13.9
7.0
2.3
5.3
9.0
3.5
8.0
12.0
5.7
13.1
7.0
2.2
5.0
9.0
3.3
7.6
12.0
5.4
12.5
7.0
2.1
4.8
9.0
3.1
7.3
12.0
5.2
11.9
7.0
2.0
4.6
9.0
3.0
7.0
12.0
4.9
11.4
7.0
1.9
4.4
9.0
2.9
6.7
12.0
4.8
11.0
7.0
1.9
4.4
9.0
2.8
6.6
12.0
4.7
10.8
Heating
Aiflow
HC
HE
LAT
CFM MBtuh MBtuh
°F
1600 37.1
26.9
91.5
1500 37.0
26.7
92.8
1600 36.2
25.9
90.9
1500 36.2
25.9
92.3
1600 37.0
26.7
91.4
1500 36.9
26.6
92.8
1600 37.9
27.6
91.9
1500 37.9
27.5
93.4
1600 41.0
30.4
93.7
1500 40.9
30.2
95.2
1600 41.9
31.3
94.2
1500 41.8
31.1
95.8
1600 42.9
32.2
94.8
1500 42.8
32.1
96.4
1600 45.4
34.4
96.3
1500 45.3
34.3
98.0
1600 46.4
35.4
96.9
1500 46.3
35.3
98.6
1600 47.5
36.5
97.5
1500 47.4
36.3
99.3
1600 48.2
37.0
97.9
1500 48.0
36.8
99.6
1600 49.2
38.0
98.5
1500 49.1
37.9 100.3
1600 50.4
39.2
99.2
1500 50.3
39.0 101.0
1600 50.2
38.8
99.1
1500 50.1
38.7 100.9
1600 51.3
39.9
99.7
1500 51.2
39.8 101.6
1600 52.5
41.1 100.4
1500 52.4
40.9 102.3
1600 52.7
41.1 100.5
1500 52.6
41.0 102.5
1600 53.8
42.2 101.1
1500 53.7
42.1 103.1
1600 55.2
43.6 101.9
1500 55.0
43.3 104.0
1600 54.9
43.2 101.8
1500 54.8
43.0 103.8
1600 56.1
44.4 102.5
1500 56.0
44.2 104.6
1600 57.5
45.7 103.3
1500 57.3
45.5 105.4
Cooling
COP
DH Aiflow
TC
SC
HR
EER
S/T
kW
W/W MBtuh CFM MBtuh MBtuh
MBtuh
Btuh/W
3.00 3.62 4.9
3.02 3.59 4.9
3.02 3.51 4.8
3.03 3.50 4.8
3.01 3.60 4.9
3.03 3.57 4.9
3.03 3.66 5.0
Operation Not Recommended
3.04 3.65 5.0
3.12 3.85 5.4
3.13 3.83 5.5
3.11 3.95 5.5
3.13 3.91 5.6
3.13 4.02 5.7
3.14 3.99 5.9
3.21 4.14 6.0
1650 57.4
39.4
0.69
65.7 2.44 23.5
3.23 4.11 6.0
1525 57.0
38.0
0.67
65.2 2.39 23.8
3.21 4.24 6.1
1650 56.9
39.3
0.69
65.1 2.40 23.7
3.23 4.20 6.1
1525 56.5
38.0
0.67
64.5 2.35 24.0
3.22 4.32 6.3
1650 57.5
39.6
0.69
65.5 2.33 24.7
3.24 4.29 6.3
1525 57.1
38.3
0.67
64.9 2.28 25.0
3.28 4.31 6.3
1650 55.7
38.8
0.70
64.8 2.68 20.8
3.29 4.27 6.3
1525 55.4
37.5
0.68
64.3 2.62 21.1
3.28 4.39 6.5
1650 55.2
38.7
0.70
64.2 2.64 20.9
3.29 4.37 6.6
1525 54.9
37.4
0.68
63.7 2.58 21.3
3.29 4.49 6.7
1650 55.9
39.0
0.70
64.6 2.56 21.8
3.31 4.45 6.7
1525 55.5
37.7
0.68
64.1 2.51 22.1
3.33 4.42 6.5
1650 54.0
38.1
0.71
64.1 2.97 18.2
3.35 4.38 6.5
1525 53.6
36.8
0.69
63.5 2.90 18.5
3.33 4.51 6.8
1650 53.5
38.0
0.71
63.5 2.92 18.3
3.35 4.48 6.8
1525 53.1
36.7
0.69
62.9 2.86 18.6
3.34 4.61 7.0
1650 54.1
38.3
0.71
63.8 2.84 19.0
3.36 4.57 7.0
1525 53.7
37.0
0.69
63.2 2.77 19.4
3.39 4.55 6.9
1650 51.5
37.0
0.72
62.7 3.28 15.7
3.41 4.52 7.0
1525 51.1
35.8
0.70
62.0 3.20 16.0
3.39 4.65 7.1
1650 51.0
36.9
0.72
62.0 3.23 15.8
3.40 4.63 7.2
1525 50.7
35.7
0.70
61.5 3.16 16.0
3.40 4.76 7.3
1650 51.6
37.2
0.72
62.3 3.13 16.5
3.42 4.71 7.3
1525 51.2
36.0
0.70
61.6 3.06 16.7
3.44 4.68 7.2
1650 48.6
35.7
0.73
61.1 3.67 13.2
3.46 4.64 7.2
1525 48.3
34.5
0.71
60.6 3.59 13.5
3.44 4.78 7.4
1650 48.2
35.7
0.74
60.6 3.62 13.3
3.46 4.74 7.4
1525 47.8
34.4
0.72
59.9 3.54 13.5
3.45 4.88 7.6
1650 48.7
35.9
0.74
60.7 3.51 13.9
3.47 4.84 7.6
1525 48.4
34.7
0.72
60.1 3.43 14.1
1650 45.9
34.4
0.75
60.2 4.19 11.0
1525 45.5
33.2
0.73
59.5 4.09 11.1
1650 45.4
34.4
0.76
59.5 4.12 11.0
1525 45.1
33.2
0.74
58.9 4.03 11.2
1650 45.9
34.6
0.75
59.6 4.00 11.5
1525 45.6
33.5
0.73
58.9 3.91 11.7
Operation Not Recommended
1650 42.9
33.0
0.77
59.0 4.72 9.1
1525 42.7
31.9
0.75
58.5 4.62 9.2
1650 42.5
33.0
0.78
58.4 4.65 9.1
1525 42.3
31.8
0.75
57.8 4.55 9.3
1650 43.0
33.2
0.77
58.4 4.52 9.5
1525 42.7
32.1
0.75
57.8 4.42 9.7
kW
DH
MBtuh
4.7
4.5
4.3
4.2
4.2
4.1
5.7
5.5
5.4
5.2
5.2
5.0
6.6
6.4
6.4
6.2
6.1
5.9
7.6
7.4
7.2
7.0
7.0
6.8
8.6
8.3
8.1
7.8
8.0
7.7
9.5
9.2
9.1
8.8
8.9
8.6
10.4
10.1
10.1
9.7
9.7
9.4
Heating data based on 70F EAT; Cooling data based on 80/67F EAT. See Correction Factors on page 24 for different conditions.
Notes:
1. Capacity data includes water pumping watts and is based upon 15% (by volume) propylene glycol antifreeze solution.
2. Desuperheater capacity is based upon 0.4 GPM Flow per nominal ton at 90°F entering hot water temperature.
3. Interpolation between above catagories is permissible; extrapolation is not.
4. See Flow Rate Selection on page 7 for proper application.
Enertech Global
16
ST Models, 05 Aug 2014G
GST060C1CB
Load Operation
Section
6h:FullModel
060 with MPD060B Performance Data: 5.0 Ton,
1900 Nominal CFM Heating; 1950 Nominal CFM Cooling
Full Load, 1950 CFM Cooling / 1900 CFM Heating
EWT Flow
°F GPM
25
WPD
PSI
FT
15.0
9.7
22.5
8.0
7.4
17.0
12.0
7.9
18.3
15.0
9.2
21.3
8.0
6.3
14.5
12.0
6.8
15.7
15.0
7.9
18.2
8.0
5.6
12.9
12.0
6.0
13.9
15.0
7.0
16.2
8.0
5.5
12.6
12.0
5.9
13.6
15.0
6.8
15.7
8.0
5.6
12.9
12.0
6.0
13.9
15.0
7.0
16.1
8.0
5.6
12.9
12.0
6.0
13.9
15.0
7.0
16.2
8.0
5.2
12.1
12.0
5.6
13.0
15.0
6.5
15.1
8.0
4.7
10.7
100 12.0
5.0
11.6
15.0
5.8
13.4
8.0
4.8
11.1
110 12.0
5.2
12.0
15.0
6.0
13.9
30
40
50
60
70
80
90
Heating
Aiflow
HC
HE
LAT
CFM MBtuh MBtuh
°F
1900 44.4
31.3
91.6
1750 44.4
31.2
93.5
1900 43.1
29.9
91.0
1750 43.1
29.9
92.8
1900 44.5
31.3
91.7
1750 44.5
31.2
93.5
1900 45.4
32.2
92.1
1750 45.4
32.1
94.0
1900 48.7
35.1
93.7
1750 48.7
35.0
95.8
1900 50.3
36.6
94.5
1750 50.3
36.5
96.6
1900 51.4
37.7
95.0
1750 51.4
37.6
97.2
1900 54.0
40.0
96.3
1750 54.0
39.9
98.6
1900 55.8
41.7
97.2
1750 55.8
41.6
99.5
1900 56.9
42.8
97.7
1750 56.9
42.7 100.1
1900 57.2
42.9
97.9
1750 57.2
42.8 100.3
1900 59.2
44.9
98.8
1750 59.2
44.8 101.3
1900 60.4
46.0
99.4
1750 60.4
45.9 102.0
1900 59.6
45.1
99.0
1750 59.6
45.0 101.5
1900 61.7
47.1 100.1
1750 61.7
47.0 102.6
1900 62.9
48.3 100.7
1750 62.9
48.2 103.3
1900 62.6
47.8 100.5
1750 62.6
47.7 103.1
1900 64.7
49.9 101.5
1750 64.7
49.8 104.2
1900 66.0
51.1 102.2
1750 66.0
51.0 104.9
1900 65.2
50.2 101.8
1750 65.2
50.1 104.5
1900 67.5
52.4 102.9
1750 67.5
52.3 105.7
1900 68.8
53.7 103.5
1750 68.8
53.6 106.4
Cooling
COP
DH Aiflow
TC
SC
HR
EER
S/T
kW
W/W MBtuh CFM MBtuh MBtuh
MBtuh
Btuh/W
3.84 3.39 5.9
3.87 3.36 5.9
3.86 3.27 5.7
3.88 3.25 5.7
3.87 3.37 5.9
3.90 3.34 5.9
3.88 3.43 6.0
Operation Not Recommended
3.90 3.41 6.0
3.98 3.59 6.4
4.01 3.56 6.5
4.00 3.68 6.6
4.03 3.66 6.7
4.00 3.77 6.8
4.03 3.74 7.0
4.10 3.86 7.1
1950 69.5
47.3
0.68
80.1 3.12 22.3
4.13 3.83 7.1
1700 68.4
44.1
0.64
78.6 3.00 22.8
4.12 3.97 7.3
1950 69.5
47.4
0.68
79.9 3.04 22.9
4.15 3.94 7.3
1700 68.4
44.3
0.65
78.4 2.92 23.4
4.13 4.04 7.5
1950 70.0
47.7
0.68
80.1 2.97 23.6
4.16 4.01 7.5
1700 68.8
44.6
0.65
78.5 2.85 24.1
4.19 4.00 7.5
1950 67.6
46.5
0.69
79.3 3.44 19.7
4.22 3.97 7.6
1700 66.4
43.5
0.66
77.7 3.30 20.1
4.20 4.13 7.8
1950 67.6
46.7
0.69
79.0 3.34 20.2
4.23 4.10 7.9
1700 66.4
43.6
0.66
77.4 3.21 20.7
4.21 4.20 8.0
1950 68.0
47.0
0.69
79.1 3.26 20.9
4.24 4.17 8.0
1700 66.8
43.9
0.66
77.5 3.14 21.3
4.26 4.10 7.8
1950 65.4
45.7
0.70
78.4 3.80 17.2
4.29 4.07 7.8
1700 64.3
42.7
0.66
76.8 3.65 17.6
4.27 4.23 8.2
1950 65.4
45.9
0.70
78.0 3.69 17.7
4.30 4.20 8.2
1700 64.3
42.8
0.67
76.4 3.55 18.1
4.28 4.31 8.4
1950 65.8
46.1
0.70
78.1 3.61 18.2
4.31 4.28 8.4
1700 64.7
43.1
0.67
76.5 3.47 18.6
4.33 4.24 8.2
1950 62.4
44.4
0.71
76.7 4.20 14.9
4.36 4.21 8.4
1700 61.3
41.5
0.68
75.1 4.03 15.2
4.35 4.36 8.6
1950 62.4
44.6
0.71
76.3 4.08 15.3
4.38 4.33 8.7
1700 61.3
41.6
0.68
74.7 3.92 15.6
4.36 4.44 8.8
1950 62.8
44.8
0.71
76.4 3.99 15.7
4.39 4.40 8.7
1700 61.7
41.9
0.68
74.8 3.83 16.1
4.40 4.34 8.6
1950 58.9
42.9
0.73
74.9 4.70 12.5
4.43 4.31 8.6
1700 57.9
40.1
0.69
73.3 4.52 12.8
4.42 4.47 8.9
1950 58.9
43.0
0.73
74.5 4.57 12.9
4.45 4.44 8.9
1700 57.9
40.2
0.69
72.9 4.39 13.2
4.42 4.56 9.2
1950 59.3
43.3
0.73
74.6 4.47 13.3
4.46 4.52 9.2
1700 58.3
40.4
0.69
72.9 4.29 13.6
1950 55.6
41.3
0.74
73.9 5.36 10.4
1700 54.6
38.6
0.71
72.2 5.15 10.6
1950 55.6
41.5
0.75
73.3 5.20 10.7
1700 54.6
38.7
0.71
71.7 5.00 10.9
1950 55.9
41.7
0.75
73.3 5.09 11.0
1700 55.0
39.0
0.71
71.7 4.89 11.2
Operation Not Recommended
1950 52.0
39.6
0.76
72.6 6.05 8.6
1700 51.2
37.0
0.72
71.1 5.82 8.8
1950 52.0
39.8
0.77
72.1 5.88 8.8
1700 51.2
37.2
0.73
70.5 5.65 9.1
1950 52.3
40.0
0.76
71.9 5.75 9.1
1700 51.5
37.4
0.73
70.4 5.53 9.3
kW
DH
MBtuh
5.6
5.2
5.2
4.9
5.1
4.8
6.8
6.4
6.5
6.1
6.2
5.8
8.0
7.5
7.7
7.2
7.3
6.8
9.2
8.6
8.8
8.2
8.4
7.9
10.3
9.6
9.7
9.1
9.6
9.0
11.4
10.7
10.9
10.2
10.7
10.0
12.5
11.7
12.1
11.3
11.8
11.0
Heating data based on 70F EAT; Cooling data based on 80/67F EAT. See Correction Factors on page 24 for different conditions.
Notes:
1. Capacity data includes water pumping watts and is based upon 15% (by volume) propylene glycol antifreeze solution.
2. Desuperheater capacity is based upon 0.4 GPM Flow per nominal ton at 90°F entering hot water temperature.
3. Interpolation between above catagories is permissible; extrapolation is not.
4. See Flow Rate Selection on page 7 for proper application.
ST Models, 05 Aug 2014G
17
Enertech Global
GST072C1CB
Load Operation
Section
6j:Full
Model
072 with MPD072A Performance Data: 6.0 Ton,
2050 Nominal CFM Heating; 2100 Nominal CFM Cooling
Full Load, 2100 CFM Cooling / 2100 CFM Heating
EWT Flow
°F GPM
25
WPD
PSI
FT
18.0 10.4
24.0
12.0
5.0
11.5
15.0
7.4
17.1
18.0
10.1
23.3
12.0
4.7
10.8
15.0
6.9
16.0
18.0
9.5
21.8
12.0
4.4
10.1
15.0
6.5
15.0
18.0
8.9
20.5
12.0
4.2
9.6
15.0
6.1
14.2
18.0
8.4
19.4
12.0
4.0
9.2
15.0
5.9
13.6
18.0
8.1
18.7
12.0
3.9
9.0
15.0
5.7
13.2
18.0
7.8
18.1
12.0
3.8
8.7
15.0
5.6
12.9
18.0
7.6
17.6
12.0
3.7
8.5
100 15.0
5.4
12.5
18.0
7.4
17.1
12.0
3.5
8.2
110 15.0
5.2
12.1
18.0
7.2
16.5
30
40
50
60
70
80
90
Heating
Aiflow
HC
HE
LAT
CFM MBtuh MBtuh
°F
2050 51.4
35.6
93.2
1700 50.4
34.7
97.5
2050 52.5
36.7
93.7
1700 51.5
35.8
98.1
2050 53.1
37.2
94.0
1700 52.0
36.2
98.3
2050 53.1
37.1
94.0
1700 52.1
36.2
98.4
2050 59.1
42.6
96.7
1700 57.9
41.5 101.5
2050 59.7
43.1
97.0
1700 58.6
42.1 101.9
2050 59.8
43.1
97.0
1700 58.6
41.9 101.9
2050 65.2
48.0
99.4
1700 63.9
46.8 104.8
2050 65.9
48.6
99.8
1700 64.6
47.4 105.2
2050 66.0
48.6
99.8
1700 64.7
47.4 105.2
2050 69.3
51.7 101.3
1700 68.0
50.5 107.0
2050 70.1
52.4 101.7
1700 68.7
51.1 107.4
2050 70.1
52.3 101.7
1700 68.8
51.0 107.5
2050 72.3
54.4 102.7
1700 70.9
53.1 108.6
2050 73.1
55.1 103.0
1700 71.6
53.7 109.0
2050 73.1
54.9 103.0
1700 71.7
53.6 109.1
2050 75.4
57.2 104.1
1700 73.9
55.8 110.3
2050 76.2
57.9 104.4
1700 74.7
56.5 110.7
2050 76.3
57.8 104.5
1700 74.8
56.4 110.7
2050 78.0
59.6 105.2
1700 76.5
58.1 111.7
2050 78.8
60.3 105.6
1700 77.3
58.9 112.1
2050 78.9
60.2 105.6
1700 77.4
58.8 112.2
Cooling
COP
DH Aiflow
TC
SC
HR
EER
S/T
kW
W/W MBtuh CFM MBtuh MBtuh
MBtuh
Btuh/W
4.62 3.26 6.9
4.60 3.21 6.8
4.62 3.33 7.0
4.60 3.28 6.9
4.65 3.35 7.0
4.62 3.30 6.9
4.68 3.32 7.0
Operation Not Recommended
4.66 3.28 6.9
4.84 3.58 7.8
4.81 3.53 7.8
4.86 3.60 7.8
4.84 3.55 7.8
4.90 3.58 7.8
4.88 3.52 8.2
5.03 3.80 8.7
2100 77.5
51.8
0.67
90.3 3.74 20.7
5.01 3.74 8.5
1750 76.0
47.4
0.62
88.0 3.51 21.7
5.06 3.82 8.7
2100 77.7
51.7
0.67
90.1 3.63 21.4
5.04 3.76 8.5
1750 76.2
47.3
0.62
87.9 3.42 22.3
5.10 3.79 8.7
2100 77.6
51.4
0.66
89.8 3.58 21.7
5.08 3.73 8.5
1750 76.2
47.1
0.62
87.7 3.36 22.7
5.16 3.94 9.0
2100 74.6
50.8
0.68
88.5 4.07 18.3
5.14 3.88 9.0
1750 73.1
46.5
0.64
86.1 3.82 19.1
5.19 3.96 9.1
2100 74.7
50.7
0.68
88.2 3.95 18.9
5.17 3.89 9.1
1750 73.3
46.4
0.63
86.0 3.72 19.7
5.23 3.93 9.1
2100 74.7
50.5
0.68
88.0 3.89 19.2
5.21 3.87 9.3
1750 73.3
46.2
0.63
85.8 3.66 20.0
5.25 4.03 9.5
2100 71.6
49.8
0.70
86.8 4.44 16.1
5.23 3.97 9.3
1750 70.2
45.6
0.65
84.4 4.17 16.8
5.28 4.06 9.7
2100 71.7
49.7
0.69
86.4 4.31 16.6
5.25 4.00 9.5
1750 70.3
45.5
0.65
84.2 4.06 17.3
5.32 4.03 9.7
2100 71.7
49.5
0.69
86.2 4.25 16.9
5.30 3.96 9.5
1750 70.3
45.3
0.64
84.0 4.00 17.6
5.34 4.14 9.8
2100 68.8
48.6
0.71
85.4 4.87 14.1
5.31 4.08 9.9
1750 67.5
44.5
0.66
83.1 4.58 14.7
5.36 4.17 10.0 2100 68.9
48.5
0.70
85.0 4.73 14.6
5.34 4.10 10.0 1750 67.6
44.4
0.66
82.8 4.45 15.2
5.41 4.13 10.0 2100 68.9
48.2
0.70
84.8 4.66 14.8
5.38 4.07 10.1 1750 67.6
44.2
0.65
82.6 4.39 15.4
5.40 4.23 10.3 2100 65.9
47.1
0.71
84.4 5.41 12.2
5.38 4.17 10.1 1750 64.6
43.1
0.67
82.0 5.09 12.7
5.43 4.25 10.4 2100 66.0
47.0
0.71
84.0 5.26 12.5
5.40 4.19 10.2 1750 64.7
43.1
0.67
81.6 4.94 13.1
5.47 4.23 10.5 2100 66.0
46.8
0.71
83.7 5.18 12.7
5.45 4.16 10.3 1750 64.7
42.9
0.66
81.3 4.87 13.3
2100 62.4
45.7
0.73
83.1 6.06 10.3
1750 61.2
41.9
0.68
80.7 5.70 10.7
2100 62.5
45.6
0.73
82.6 5.89 10.6
1750 61.4
41.8
0.68
80.3 5.54 11.1
2100 62.5
45.4
0.73
82.3 5.80 10.8
1750 61.3
41.6
0.68
79.9 5.45 11.2
Operation Not Recommended
2100 58.9
44.2
0.75
81.9 6.74 8.7
1750 57.8
40.5
0.70
79.4 6.34 9.1
2100 59.0
44.2
0.75
81.4 6.55 9.0
1750 57.9
40.4
0.70
78.9 6.16 9.4
2100 59.0
44.0
0.75
81.0 6.45 9.1
1750 57.9
40.2
0.69
78.6 6.07 9.5
kW
DH
MBtuh
6.1
5.6
5.8
5.3
5.5
5.0
7.4
6.8
7.1
6.5
6.7
6.1
8.7
8.0
8.4
7.7
7.9
7.2
10.0
9.2
9.6
8.8
9.2
8.4
11.3
10.3
10.7
9.8
10.4
9.5
12.7
11.6
12.1
11.1
11.7
10.7
14.0
12.8
13.5
12.3
12.9
11.8
Heating data based on 70F EAT; Cooling data based on 80/67F EAT. See Correction Factors on page 24 for different conditions.
Notes:
1. Capacity data includes water pumping watts and is based upon 15% (by volume) propylene glycol antifreeze solution.
2. Desuperheater capacity is based upon 0.4 GPM Flow per nominal ton at 90°F entering hot water temperature.
3. Interpolation between above catagories is permissible; extrapolation is not.
4. See Flow Rate Selection on page 7 for proper application.
Enertech Global
18
ST Models, 05 Aug 2014G
Section 6k: Performance Data Correction Factors
Heating Correction Factors
EAT °F
HC
50
1.0450
60
1.0260
55
65
70
75
80
1.0347
1.0089
1.0000
0.9924
0.9870
HE
kW
1.1136
0.8208
1.0893
0.8567
1.0640
0.9019
1.0270
0.9497
1.0000
1.0000
0.9741
1.0527
0.9653
1.0522
Cooling Correction Factors
EAT
(WB) °F
55
TC
HR
kW
0.8215
0.8293
0.8635
0.9404
0.9431
0.9547
60
0.8955
65
0.9701
63
67
70
75
Sensible Cooling Correction Factors
1.0000
1.0446
1.1179
0.9001
0.9715
1.0000
1.0425
1.1124
ST Models, 05 Aug 2014G
0.9205
0.9774
1.0000
1.0335
1.0878
EAT
(WB) °F
70
75
55
1.201
1.289
63
0.852
0.995
60
65
67
70
75
19
0.943
0.797
0.624
EAT (DB) °F
80
85
1.067
1.192
0.952
1.106
1.261
0.820
0.944
0.812
0.697
1.138
1.000
0.637
90
1.188
1.343
0.817
0.983
1.067
Enertech Global
Section 7: Installation Introduction
INTRODUCTION
This geothermal heat pump provides heating
and cooling as well as optional domestic water
heating capability. Engineering and quality
control is built into every geothermal unit. Good
performance depends on proper application
and correct installation.
equivalent protective covering. Cap or recap
unit connections and all piping until unit is
installed. Precautions must be taken to avoid
physical damage and contamination which
may prevent proper start-up and may result in
costly equipment repair.
⚠ CAUTION ⚠
Notices, Cautions, Warnings, & Dangers
“NOTICE” Notification of installation, operation
or maintenance information which is important,
but which is NOT hazard-related.
“CAUTION” Indicates a potentially hazardous
situation or an unsafe practice which, if not
avoided, COULD result in minor or moderate
injury or product or property damage.
“WARNING” Indicates potentially hazardous
situation which, if not avoided, COULD result in
death or serious injury.
“DANGER” Indicates an immediate hazardous
situation which, if not avoided, WILL result in
death or serious injury.
Inspection
Upon receipt of any geothermal equipment,
carefully check the shipment against the
packing slip and the freight company bill of
lading. Verify that all units and packages have
been received. Inspect the packaging of
each package and each unit for damages.
Insure that the carrier makes proper notation
of all damages or shortage on all bill of lading
papers. Concealed damage should be
reported to the freight company within 15 days.
If not filed within 15 days the freight company
can deny all claims.
Note: Notify Enertech Global’s shipping
department of all damages within 15 days. It
is the responsibility of the purchaser to file all
necessary claims with the freight company.
Unit Protection
Protect units from damage and contamination
due to plastering (spraying), painting and
all other foreign materials that may be used
at the job site. Keep all units covered on the
job site with either the original packaging or
Enertech Global
DO NOT OPERATE THE GEOTHERMAL
HEAT PUMP UNIT DURING BUILDING
CONSTRUCTION PHASE.
Storage
All geothermal units should be stored inside in
the original packaging in a clean, dry location.
Units should be stored in an upright position
at all times. Units should not be stacked unless
specially noted on the packaging.
Pre-Installation
Special care should be taken in locating the
geothermal unit. Installation location chosen
should include adequate service clearance
around the unit. All units should be placed on a
formed plastic air pad, or a high density, closed
cell polystyrene pad slightly larger than the
base of the unit. All units should be located in
an indoor area where the ambient temperature
will remain above 55°F and should be located
in a way that piping and ductwork or other
permanently installed fixtures do not have to be
removed for servicing and filter replacement.
Pre-Installation Steps:
1.
2.
3.
4.
20
Compare the electrical data on the unit
nameplate with packing slip and ordering
information to verify that the correct unit
has been shipped.
Remove any packaging used to support
blower during shipping.
Inspect all electrical connections
and wires. Connections must be clean and
tight at the terminals, and wires should not
touch any sharp edges or copper pipe.
Verify that all refrigerant tubing is free of
dents and kinks. Refrigerant tubing should
not be touching other unit components.
ST Models, 05 Aug 2014G
Section 7: Installation Introduction
5.
6.
Before unit start-up, read all manuals and
become familiar with unit components
and operation. Thoroughly check the unit
before operating.
For A-Coil installations, it is recommended
that coil be sprayed with liquid detergent
thoroughly and rinsed thoroughly before
installation to assure proper drainage of
condensate from the coil fins to eliminate
water blowoff and to assure maximum coil
performance. If not sprayed approximately
50 hours of break in time is required to
achieve the same results.
⚠ CAUTION ⚠
ALL GEOTHERMAL EQUIPMENT IS
DESIGNED FOR INDOOR INSTALLATION
ONLY. DO NOT INSTALL OR STORE UNIT
IN A CORROSIVE ENVIRONMENT OR IN
A LOCATION WHERE TEMPERATURE AND
HUMIDITY ARE SUBJECT TO EXTREMES.
EQUIPMENT IS NOT CERTIFIED FOR
OUTDOOR APPLICATIONS. SUCH
INSTALLATION WILL VOID
ALL WARRANTIES.
⚠ WARNING ⚠
FAILURE TO FOLLOW THIS CAUTION MAY
RESULT IN PERSONAL INJURY. USE CARE
AND WEAR APPROPRIATE PROTECTIVE
CLOTHING, SAFETY GLASSES AND
PROTECTIVE GLOVES WHEN SERVICING
UNIT AND HANDLING PARTS.
⚠ CAUTION ⚠
Components
Master Contactor: Energizes Compressor
and optional Hydronic Pump and/or
Desuperheater pump package.
Logic Board: Logic Board operates the
compressor and protects unit by locking out
when safety switches are engaged. It also
provides fault indicator(s).
Terminal Strip: Provides connection to the
thermostat or other accessories to the low
voltage circuit.
Transformer: Converts incoming (source)
voltage to 24V AC.
Low Voltage Breaker: Attached directly to
transformer, protects the transformer and low
voltage circuit.
Reversing Valve: Controls the cycle of the
refrigerant system (heating or cooling).
Energized in cooling mode.
High Pressure Switch: Protects the refrigerant
system from high refrigerant pressure, by locking
unit out if pressure exceeds setting.
Low Pressure Switch: Protects the refrigerant
system from low suction pressure, if suction
pressure falls below setting.
Flow Switch (Freeze Protection Device):
Protects the water heat exchanger from
freezing, by shutting down compressor if water
flow decreases.
Compressor (Copeland Scroll): Pumps
refrigerant through the heat exchangers and
pressurizes the refrigerant, which increases the
temperature of the refrigerant.
BEFORE DRILLING OR DRIVING ANY
SCREWS INTO CABINET, CHECK TO BE
SURE THE SCREW WILL NOT HIT ANY
INTERNAL PARTS OR REFRIGERANT LINES.
ST Models, 05 Aug 2014G
21
Enertech Global
Section 8: Installation Considerations
Consumer Instructions: Dealer should
instruct the consumer in proper operation,
maintenance, filter replacements, thermostat
and indicator lights. Also provide the consumer
with the manufacturer’s Owner's Manual for the
equipment being installed.
Thermostat: Thermostats should be installed
approximately 54 inches off the floor on an
inside wall in the return air pattern and where
they are not in direct sunlight at anytime.
Loop Pumping Modules: Must be wired to the
heat pump’s electric control box. A special
entrance knockout is provided below the
thermostat entrance knockout. A pump
module connection block, connected to
the master contactor, and circuit breaker is
provided to connect the Pump Module wiring.
Enertech Global D-I-Y Policy: Enertech Global’s
geothermal heat pumps and system installations
may include electrical, refrigerant and/or water
connections. Federal, state and local codes
and regulations apply to various aspects of the
installation. Improperly installed equipment can
lead to equipment failure and health/safety
concerns. For these reasons, only qualified
technicians should install a Enertech Global built
geothermal system.
Desuperheater Package: Water heating is
standard on all residential units (units may be
ordered without). It uses excess heat, during
both heating and cooling cycles, to provide
hot water for domestic needs. A double wall
desuperheater exchanger (coil) located
between the compressor and the reversing
valve, extracts superheated vapor to heat
domestic water; while satisfying its heating and
cooling needs. The water circulation pump
comes pre-mounted in all residential units, but
must be electrically connected to the master
contactor. Leaving it disconnected ensures that
the pump will not run without a water supply.
Because of the importance of proper
installation, Enertech Global does not sell
equipment direct to homeowners. Internet
websites and HVAC outlets may allow for
purchases directly by homeowners and doit-yourselfers, but Enertech Global offers no
warranty on equipment that is purchased via
the internet or installed by persons without
proper training.
Enertech Global has set forth this policy
to ensure installations of Enertech Global
geothermal systems are done safely and
properly. The use of well-trained, qualified
technicians helps ensure that your system
provides many years of comfort and savings.
The Desuperheater package can make up to
60% (depending on heat pump usage) of most
domestic water needs, but a water heater is
still recommended.
Equipment Installation: Special care should be
taken in locating the unit. All units should be
placed on a formed plastic air pad, or a high
density, closed cell polystyrene pad slightly
larger than the base of the unit. All units should
be located in an indoor area were the ambient
temperature will remain above 55°F and should
be located in a way that piping and ductwork or
other permanently installed fixtures do not have to
be removed for servicing and filter replacement.
Desuperheater Piping: All copper tubes & fittings
should be 5/8” O.D (1/2” nom) minimum with a
maximum of 50ft separation. Piping should be
insulated with 3/8” wall closed cell insulation.
Note: Copper is the only approved material for
piping the desuperheater.
Electrical: All wiring, line and low voltage,
should comply with the manufacturer's
recommendations, The National Electrical
Code, and all local codes and ordinances.
Enertech Global
22
ST Models, 05 Aug 2014G
Section 9: Unit Placement
Section 9a: Ductwork Installation
UNIT PLACEMENT
When installing a geothermal heating and
cooling unit, there are several items the installer
should consider before placing the equipment.
DUCT WORK
All new ductwork shall be designed as
outlined in Sheet Metal and Air Conditioning
Contractors National Association (SMACNA)
or Air Conditioning Contractors of America
(ACCA) or American Society of Heating,
Refrigerating and Air Conditioning Engineers
(ASHRAE) handbooks.
Service Access. Is there enough space for
service access? A general rule of thumb is
at least 2 feet in the front and 2 feet on at
least one side.
Unit Air Pad. All geothermal heating and
cooling equipment should be placed
on either a formed plastic air pad, or a
high density, closed cell polystyrene pad.
Downflow units should be placed on a
non-combustible base. This helps eliminate
vibration noise that could be transmitted
through the floor.
The installer has verified that all applicable
wiring, ductwork, piping, and accessories
are correct and on the job site.
1.
2.
3.
PRE-INSTALLATION
Before you fully install the geothermal
equipment, it is recommended you go
through this quick checklist before placing the
equipment.
⧠
⧠
Fully inspect the unit after unpacking.
⧠
Remove all packaging materials and ties
from the rear of the blower.
⧠
Locate the Unit Start-Up form from this
manual and have it available as the unit
installation proceeds.
Open both the air handler section and
compressor section and removed any
packaging material or documentation
included in the unit.
⚠ WARNING ⚠
All supply/return plenums should be isolated
from the unit by a flexible connector (canvas)
or equivalent to prevent transfer of vibration
noise to the ductwork. The flex connector
should be designed so as not to restrict airflow.
Turning vanes should be used on any run over
500 CFM. If the unit is installed in a noninsulated
space the metal ductwork should be insulated
on the inside with fiberglass insulation or similar
insulation to prevent heat loss/gain and to
absorb air noise. If the unit is being installed
with existing ductwork, the ductwork must be
designed to handle the air volume required by
the unit being installed. When running a cooling
or heating load on a building, size ductwork
accordingly to the building design load and
heat pump CFM.
Rule of Thumb: When sizing ductwork use 400
CFM per Ton.
As a general rule, maximum recommended
face velocity for a supply outlet used in a
residential application is 800 FPM. Maximum
recommended return grille velocity is 400 FPM.
Systems with higher velocity, are likely to have
noise problems.
In buildings where ceilings are 8 feet or more,
at least 50 percent of the return air should be
taken back to the heat pump from the ceiling
or high sidewall location and not more than 50
percent from the floor or low sidewall location.
IF USING A DUAL FUEL APPLICATION, “A”
COIL MUST BE INSTALLED ON THE OUTLET
OF THE FURNACE. INSTALLATION ON THE
RETURN COULD CAUSE FURNACE HEAT
EXCHANGER FAILURE, AND MAY VOID
FURNACE WARRANTY.
ST Models, 05 Aug 2014G
⚠ NOTICE ⚠
WHEN MATCHING AN ST048 OR ST060
WITH AN MPD060B, REFER TO THE CFM
CHART ON PAGE 56 FOR THE PROPER
AIRFLOW JUMPER SETTINGS.
23
Enertech Global
Section 9a: Ductwork Installation
Figure 1: Standard Ductwork Connection Setup
Reducer
Supply Air Grille
Supply Air
Return Air Grille
Flex Connector
Flex Connector
Return Air
Never install a takeoff on or near
a reducer or on an end cap, or near
an end cap. Exceptions may apply
Takeoff runs should
never be installed on a
reducer. Takeoffs
should be installed 6"
before a reducer and
at least 24" to 36"
past any reducer.
Air Handler
Return Air Plenum
The air handling unit comes with an ECM
blower motor. For maximum performance,
the blower speed should be set to maintain
between 350 and 450 CFM/ton. Changing
the wires (for PSC) at the blower will change
the blower speed.
Table 1: Maximum Air Velocities
Location
Supply
Return
Main Ducts
900 FPM
600 FPM
Grills, Registers, Diffusers
750 FPM
600 FPM
Branch Ducts
Enertech Global
700 FPM
600 FPM
24
ST Models, 05 Aug 2014G
Section 9a: Ductwork Installation
Figure 2: Ductwork with Split Damper Connection Setup
Thermostat
No. 2
Reducer
Never install a takeoff on or near a reducer or
on an end cap, or near a end cap.
Exceptions may apply.
Supply Air Grille
Thermostat
No. 1
Damper
Motor
Shift Damper
Return Air
Flex Connector
Bypass
damper
not
shown
Split
Damper
Air Handler
Supply Air
Flex Connector
Takeoff runs should
never be installed on a
reducer. Takeoffs
should be installed 6"
before a reducer and
at least 24" to 36"
past any reducer.
Note: A bypass damper
is almost always required
for zoning systems.
Return Air Plenum
ST Models, 05 Aug 2014G
25
Enertech Global
Section 9b: Filter Drier Installation
INSTALLATION
A reversible heat pump filter drier must be
installed on the liquid line near the cabinet of
the compressor section. A filter drier is furnished
with the unit. The filter drier kit includes a 3”
piece of 1/2” or 5/8” copper tubing. This tubing
will fit either inside or on the outside of the stub
coming off the liquid line service valve. Braze
it in place. Then braze the filter drier onto it.
Make sure the arrow on the filter drier points in
the appropriate direction. A second piece of
copper is attached between the filter drier and
the liquid line (not needed for all applications,
depending upon line set size -- consult line set
sizing chart).
Refer to the split system I.O.M. (installation,
operating, and maintenance) manual for
details on line set and unit installation. Always
use dry nitrogen when brazing.
Table 2: Recommended Line Set Sizes
Model
024
Recommended Liquid & Suction Line Size
Unit Refrigerant Connections
20 Feet
50 Feet
Liquid Line
(OD)
Suction Line
(OD)
Liquid Line
(OD)
Suction Line
(OD)
3/8
7/8
3/8
7/8
3/8
036
048
3/8
060
1/2
072
1/2
7/8
7/8
1-1/8
1-1/8
3/8
3/4**
3/8
7/8
1/2
1-1/8
1/2
1-1/8
40°F Evaporating Temperature
*Suction line is not sized large in two-stage units due to the lower velocity of first stage operation.
**Reduce from 7/8” unit connection to 3/4” suction line for proper velocity
Figure 3: Filter Drier Installation
Enertech Global
Liquid Line
(OD)
Filter
Drier
Suction Line
(OD)
Two-stage unit’s line sizes
should not be increased due
to reduced pumping capacity
in first stage.
Weight of refrigerant in copper lines
per 10 feet
Liquid Line Size
(OD)
Oz. Per 10 Feet
1/2”
10.4
3/8”
Liquid
Line
Split
Compressor
Section
*
5/8”
5.4
19.5
Line Set
Suction Line
26
ST Models, 05 Aug 2014G
Section 9c: Line Set Installation
INTRODUCTION
The purpose of this section is to help in the
design of refrigeration line sets on geothermal
heat pump systems. The three considerations
when designing a refrigerant piping system are
as follows:
1.
System Reliability: Poor Oil Management
may shorten the life of the compressor.
Proper liquid refrigerant control is essential.
2.
System Performance: Pressure drop
in refrigerant lines tends to decrease
capacity and increase power
consumption. High velocities can increase
sound levels. Modulation often depends
on proper piping.
3.
Cost: Level of refrigerant, copper piping,
accessories, and labor used will impact the
applied cost.
DEFINITIONS
Long line set applications are defined as
any line set that includes 50 feet or more of
interconnecting tubing or a vertical distance
between the evaporator and compressor
sections exceeding 20 feet.
LINE SET REQUIREMENTS/LIMITATIONS
Line Set Limitations
Up to 50 equivalent feet: Use rated line sizes
listed in unit installation instructions.
50 - 75 equivalent feet or 20 feet of vertical
separation: Bi-flow liquid line solenoid and
crankcase heater required (refer to table 1 and
piping diagrams pages 5, 6, & 7).
and field installed accessories such as a drier,
solenoid valve or other devices should be
considered (see Table 3). The pressure drop
due to friction is usually smaller than pressure
drop due to lift. The pressure drop ratings of
field installed devices are usually supplied by
the manufacturer of the device and should be
used if available.
Equivalent Length
Valves, fittings, and bends create more friction
pressure drop than straight copper piping. Find
the equivalent feet of straight tubing for each
fitting for calculations. This allows for a quick
calculation of the total equivalent length (see
Example 1). The equivalent length of copper
tubing for commonly used fittings, valves, and
filter-drier are shown in Table 3.
Total Equivalent Length = Linear Feet of Straight
Tubing + Fitting Losses in Equivalent Feet
Example 1: A 3-ton unit with 7/8” vapor tubing
has 50 linear feet of straight tubing. The total
number of elbows includes three long radius 90º
elbows and five standard 90º elbows.
50ft. of straight tubing
+
4 standard 90º elbows X 2 equiv ft
+
1 liquid line solenoid X 12 equiv ft
+
1 filter-drier X 6 equiv ft
= 50ft. + 8ft. + 12ft. + 6ft.
= 76 ft. total equivalent length
Table 3: Copper Fittings in Equivalent Length
Maximum Piping Lengths:
Maximum equivalent length = 75 feet
Maximum linear length = 50 feet
Maximum linear liquid lift = 50 feet
Maximum linear vapor rise =
50 feet (Single Speed)/25 feet (Two Stage)
FITTINGS AND COMPONENTS
All piping should be “ACR” or “L” type copper
pipe. Long radius fittings should always be
used unless there is not enough physical space.
Pressure drop due to friction in pipe, fittings
ST Models, 05 Aug 2014G
27
Tube Size
O.D. (in.)
90° Std
A
90° Long
Radius - B
45° Std
C
45° Long
Radius
3/8”
1.2
0.8
0.5
0.3
1/2”
1.3
0.9
0.6
0.4
5/8”
1.6
1.0
0.8
0.5
3/4”
1.8
1.2
0.9
0.6
7/8”
2.0
1.4
1.0
0.7
1-1/8”
2.6
1.7
1.3
0.9
Liquid
Line
Solenoid
12
Filter
6
Enertech Global
Section 9c: Line Set Installation
Liquid Line
Pressure drop due to vertical liquid lift must
be considered. The pressure drop for vertical
lift is 0.43 pound per foot for R-410A. This is
usually large and may be a limiting factor in
the ultimate design of the system. Next, the
pressure entering the expansion device must
be sufficient to produce the required flow
through the expansion device. A pressure drop
of 175 psi for R-410A across the expansion valve
and distributor is necessary to produce full
refrigerant flow at rated capacity. Therefore, it
is necessary for liquid refrigerant (free of flash
gas) to be delivered to the expansion valve.
Longer line sets may require a larger liquid line
due to the higher pressure drops of smaller
diameter tubing. Reference the Installation
Manual for recommended liquid line sizes for
each unit. Even liquid lines on two stage units
can be increased because velocities required
for oil return are not critical in the liquid line.
LINE SETS
Vapor Line
A long line set application can critically
increase the charge level needed for a
system. As a result, the system is very prone
to refrigerant migration during its off-cycle.
A crankcase heater and bi-flow liquid line
solenoid will help minimize this risk. A crankcase
heater and bi-flow liquid line solenoid is
recommended for any line set over 50 feet
in equivalent length or 20 feet of vertical
separation. Because oil separates from the
refrigerant in the evaporator, the vapor line
velocity must be adequate to carry the oil
along with the refrigerant. Horizontal vapor
lines require a minimum of 800 fpm velocity for
oil entrainment. Vapor risers require 1200 fpm
minimum, and preferably 1500 fpm regardless
of the length of the riser.
NOTE: When a two-stage compressor section
is located above the indoor coil, the maximum
vertical rise of a vapor line must not exceed 25
feet. This limit is due to velocity requirements
for oil entrainment in the vapor riser.
Figure 4: Oil Trap Construction
For example, a 4 ton unit producing 48,000
Btuh with a 7/8” vapor line has a velocity of
1500 fpm (See Figure 5). On first stage the
compressor runs at 67% or 32,680 Btuh and has
a velocity of less than 1200 fpm per the pressure
drop chart. In order to achieve velocity
up to 1500 fpm in first stage, the line would
have to be 3/4”. The pressure drop for 48,000
Btuh would be over 9 psi. A system will lose
approximately 1% capacity for every pound of
pressure drop due to friction in the suction line.
This 1% factor is used to estimate the capacity
loss of refrigerant lines. Due to the low velocities
created in the vapor line in first stage, a two
stage unit vapor line should not be increased
from the pipe size at the compressor section.
45º Ell
90º Long
Radius
Street Ell
45º Ell
90º Short
Radius
Street Ell
For all vapor line trapping see Figure 4.
Remember to add all the fittings into the total
equivalent length of the vapor line.
Enertech Global
28
ST Models, 05 Aug 2014G
Section 9c: Line Set Installation
Figure 5: Refrigerant R-410A Suction Line Pressure Drop/Velocity per 100 ft. of Line
at 45ºF Evaporating Temperature and 125ºF Condensing Temperature
25
20
15
1-
5/
3000 fpm
1-
3/
city
Vel
o
1-
city
5
2000 fpm
4
Vel
o
4 ton
(Full load)
Vel
o
3
O.
D.
7
6
O.
D.
5
4
O.
D.
3
1200 fpm
7/
8”
O.
D.
1.5
4”
1/
2”
O.
D.
Su
O.
D.
city
3/
2
Vel
o
2
1.0
.9
.8
.7
40 30
8”
8”
8”
10
9
8
city
4 ton
(Part load)
1/
1500 fpm
Vel
o
7
6
city
10
9
8
Vel
o
Cooling Capacity (Tons)
12.5
600 fpm
1.5
ct
i
5/ on
8” Lin
O. e
D. Si
ze
20 15
Cooling Capacity (Tons)
R-410A Suction Line Pressure Drop (lbs./100 ft.)
10 9 8 7 6 5 4 3
2 1.5 1.0 .9 .8 .7 .6 .5 .4 .3
.2
30
Su
ct
25
2- ion
5/ L
8” in
O. e S
20
D. iz
e
21/
15
8”
O.
D.
12.5
20 15
city
40 30
30
10 9 8 7 6 5 4 3
2 1.5 1.0 .9 .8 .7 .6 .5 .4
R-410A Suction Line Pressure Drop (lbs./100 ft.)
.3
.2
1.0
.9
.8
.7
To use this chart, first find capacity (tons) on the left side of the chart. To find pipe size, procede
right to the smallest pipe size. Pressure drop (vertical line) and velocity (diagonal lines) can then
be determined for the pipe size selected. For example, for a 4 ton unit, select 7/8” O.D. line.
NOTE: Shaded area denotes unacceptable velocity range.
ST Models, 05 Aug 2014G
29
Enertech Global
Section 9c: Line Set Installation
GEOTHERMAL REFRIGERATION CIRCUITS
Bi-Flow Liquid Line Solenoid Valve
In order to minimize off-cycle refrigerant
migration to the compressor, a bi-flow liquid
line solenoid is required for all long line set
heat pump applications. The Bi-flow solenoid
valve controls the flow of refrigerant only in the
direction of the arrow molded into the valve.
The bi-flow liquid line solenoid valve is shipped
as a single flow valve, the carton contains
another valve stem which needs to be installed
in the valve to convert it to a bi-flow valve.
The bi-flow valve should be connected to the
24V side of the contactor. When installing the
valve, the arrow should be positioned toward
the compressor section to minimize the transfer
of liquid directly into the coax in the heating
mode. The solenoid should be installed right
after the filter-drier or within two feet of the
compressor section.
PIPING DIAGRAMS
The piping diagrams on the following pages
illustrate considerations for applications of a
solenoid valve, traps, and piping based upon the
location of the compressor section and air handler.
Table 4: Refrigerant Weight
Weight of Refrigerant in Copper Tubing
Per Foot (in Ounces)
O.D. (in.)
Liquid Line
3/8”
0.54
1/2”
1.04
5/8”
1.95
Suction
(Vapor) Line
0.07
3/4”
0.10
7/8”
0.13
1-1/8”
0.21
Charging Information
Since the lengths of line sets vary, it is necessary
to calculate additional refrigerant charge.
Compressor sections do not have additional
charge for the line set. Each foot of liquid
line and vapor length requires the amount of
refrigerant designated in Table 4. Also, long line
applications require a minimum of 10 degrees
subcooling to prevent any refrigerant flashing
before the thermostatic expansion valve. The
subcooling and superheat should be checked
in both modes of operation. Refer to the
operating pressure chart in the Specifications
manual for the correct superheat.
Enertech Global
30
ST Models, 05 Aug 2014G
Section 9c: Line Set Installation
SPLIT SYSTEM CHARGING - APPROACH METHOD
Charging Enertech split systems can easily
be accomplished by measuring approach
temperatures when operating in the cooling
mode. This method, outlined in the steps below,
is based upon testing in Enertech’s R & D
labs with matched compressor/air handler or
A-coil components. For best results, the indoor
temperature should be between 70°F and 85°F
in cooling. Charging the unit in cooling is the
most accurate method. If unable to charge the
unit in cooling mode, refer to the next section,
“Split System Charging -- Subcooling/Superheat
Method.” Refer to figure 6 for temperature and
pressure measurement locations when using
the approach method.
Please Note: Before utilizing the approach
method for checking the system charge,
confirm the system reaches a minimum of 2ºF
subcooling, while maintaining a maximum of
22ºF superheat. If you are not able to achieve
these readings, further troubleshooting will be
required (Reference Table 12 in Section 15,
Refrigeration Troubleshooting). Consult the
Refrigeration/Troubleshooting manual for a
review of Superheat/Subcooling calculations.
1.
2.
3.
If the entering water temperature is above
45°F and the entering air temperature is
above 70°F, the unit should be charged
in cooling for the most accurate results. If
the return air temperature is below 70°F,
it may be necessary to run the system in
emergency heating mode to raise the
indoor temperature above 70°F.
Evacuate the line set and A-coil. Open
the service valves, and monitor the
system pressures while charging. Model
024 is charged with 36oz; model 036 is
charged with 56oz; and models 048 072 are charged with 80oz. This factory
charge is a “starting” supply. Charge will
need to be added for the line set and
heat exchangers. However, do not add
charge until the unit has run for at least five
minutes, and the subcooling is above 2°F
(see step #3).
The approach temperatures will not be
usable if there is not a liquid lock at the
liquid line (i.e. there is some subcooling
at the liquid line). Record the liquid line
ST Models, 05 Aug 2014G
4.
5.
6.
pressure and the saturation temperature
(most gauge sets show saturation
temperature on the gauge). Measure the
liquid line temperature. If the liquid line is
not at least 2°F cooler than the liquid line
saturation temperature, there may not
be a liquid lock. Continue to add charge
until subcooling reaches at least 2°F. Then,
proceed to step #4.
Measure the water flow rate and entering
water temperature (EWT). Measure the
liquid line temperature (using the same
digital thermometer if possible).
Subtract the EWT from the liquid line
temperature (LLT) to determine approach
temperature (Approach temperature =
LLT - EWT).
Compare the result to Table 5. If the
approach temperature is too high, add
charge; if it’s too low, recover charge.
Approach temperature should be within
1°F of the table value.
SPLIT SYSTEM CHARGING - SUBCOOLING/
SUPERHEAT METHOD
If checking charge in the heating mode
(preferred charging mode is cooling), follow
the steps below. For best results, the indoor
temperature should be between 60°F and 70°F
in heating. If the return air temperature is below
60°F, it may be necessary to run the system in
emergency heating mode to raise the indoor
temperature above 60°F. Refer to figure 7 for
temperature and pressure measurement locations
when using the Subcooling/Superheat method.
1.
2.
31
Evacuate the line set and A-coil. Open
the service valves, and monitor the system
pressures while charging. The compressor
section is charged for the compressor
section and air handler/A-coil only (except
model 024, which includes about 65% of this
charge for manufacturing process reasons).
Charge will need to be added for the line
set (and heat exchangers for model 024).
However, do not add charge until the unit
has run for at least five minutes, and the
subcooling is above 2°F (see step #2).
The system will not be stable if there is not
a liquid lock at the liquid line (i.e. there is
some subcooling at the liquid line). Record
the liquid line pressure and the saturation
Enertech Global
Table 5: Approach Temperatures-Cooling Mode*
Full Load Operation / Desuperheater Disconnected
Water Flow
GPM/ton
Entering
Water Temp.,
deg F
2.25
024
036
048
060
072
13
11
17
14
16
55
10
10
14
11
16
8
8
10
9
15
75
6
7
8
8
13
85
4
7
7
6
12
70 - 85
45
8
7
11
10
14
55
6
6
8
8
13
4
5
6
6
11
65
70 - 85
75
3
4
5
5
10
85
2
4
4
4
8
45
8
7
11
9
12
55
3.0
Approach Temp. by Model, deg. F
Full Load -- Desuperheater Off
45
65
1.5
Entering Air
DB Temp.,
deg F
5
6
8
7
11
3
5
6
5
10
75
2
4
5
4
8
85
2
4
4
3
7
65
70 - 85
*Cooling approach temperature = Liquid Line temp - Entering Water temp
(should be within +/- 1 deg F)
Figure 6: Cooling Mode -- Temperature & Pressure Measurement Locations
Air Handler
Compressor Section
Common liquid line
Suction
To suction line bulb
Filter Drier
To suction line
Air Coil
R-410A Manifold/Gauge Set
To suction line
IN
IN
Clg TXV
Htg TXV
Reversing
Valve
Line set
Condenser (heating)
Evaporator (cooling)
Discharge
Optional desuperheater
installed in discharge line
(always disconnect during
troubleshooting)
Water IN
Condenser (cooling)
Evaporator (heating)
Suction
Thermometer
°F
1
Discharge
To suction line bulb
Source
Coax
2
NOTE: Check water flow via pressure drop method (pressurized systems) or flow
meter tool (non-pressurized systems). Compare water flow to chart in Table 2.
Enertech Global
32
ST Models, 05 Aug 2014G
Section 9c: Line Set Installation
3.
4.
temperature (most gauge sets show
saturation temperature on the gauge).
Measure the liquid line temperature at the
air handler. If the liquid line is not at least
2°F cooler than the liquid line saturation
temperature (i.e. 2°F Subcooling), there
may not be a liquid lock. Continue to add
charge until subcooling reaches at least
2°F. Then, proceed to step #3.
Record the suction pressure and the
saturation temperature (most gauge
sets show saturation temperature
on the gauge). Measure the suction
line temperature. If the suction line
temperature is more than 15°F higher
than the saturation temperature (i.e. 15°F
Superheat), the unit is undercharged.
Continue to add charge to the unit,
comparing the Superheat/Subcooling
results to Table 6. Stop adding charge when
the Superheat/Subcooling values are within
range. Each time the refrigerant charge
is adjusted, allow at least five minutes run
time for the system to stabilize.
Table 6: Subcooling/Superheat-Heating Mode*
Full Load Operation / Desuperheater Disconnected
Model
Entering
Entering
Water Temp., Air Temp.,
deg. F
deg. F
Subcooling
Superheat
3-5
8 - 10
2-4
9 - 11
2-4
9 - 11
7-9
5-7
7-9
5-7
7-9
5-7
4-6
6-8
4-6
7-9
4-6
9 - 11
2-4
4-6
3-5
5-7
50
6-8
5-7
32
5-7
4-6
32
024
40
60 - 70
50
32
036
40
60 - 70
50
32
048
40
60 - 70
50
32
060
40
072
60 - 70
40
60 - 70
50
6-8
9 - 11
8 - 10
10 - 12
*Valid for flow rates between 1.5 and 3 GPM/ton.
Figure 7: Heating Mode -- Temperature & Pressure Measurement Locations
Air Handler
Compressor Section
Common liquid line
To suction line bulb
Filter Drier
To suction line
Discharge
R-410A Manifold/Gauge Set
To suction line
IN
IN
Clg TXV
Suction
To suction line bulb
Htg TXV
LAT
Air Coil
Air Flow
EAT
Reversing
Valve
Line set
Condenser (heating)
Evaporator (cooling)
Discharge
Optional desuperheater
installed in discharge line
(always disconnect during
troubleshooting)
Thermometer
Suction
°F
Source
Coax
1 2 3
ST Models, 05 Aug 2014G
Condenser (cooling)
Evaporator (heating)
33
Enertech Global
Section 9c: Line Set Installation
Figure 8: Air handler section above compressor section
Vapor Line
Trap
Air Handler
Section
Compressor
Section
Vapor Line
Trap
50 ft. max. lift
Bi-flow liquid
line solenoid
Notes:
• Crankcase heater and Bi-flow liquid line solenoid required if total equivalent length is greater
than or equal to 50 feet or the vertical separation is greater than or equal to 20 feet. See
tables below for descriptions and part numbers.
• An inverted vapor line trap must be installed with the top of the trap above the
evaporator section.
• P-traps should be installed at the outlet of the evaporator section and at the bottom of vapor
line drop.
• 75 feet maximum equivalent line length
• 50 feet maximum vertical separation
• Vapor Line sizes on Two-stage units should not be increased due to the velocity requirements
for returning oil to the compressor.
Crankcase Heater Data
Bi-flow Solenoid Data
Compatible Models
Part Number
Compatible Models
Description
Part Number
ST024-036
11490003001
All Split Models (24-72)
1/2” Valve Body
ARS-4A
ST048-072
11490003002
24V Coil
ARSCB
Bi-flow kit
ARSBK
*Only Required In Long Line Set Applications.
Only required in long line set applications. All three parts must be ordered.
Enertech Global
34
ST Models, 05 Aug 2014G
Section 9c: Line Set Installation
Figure 9: Compressor section above air handler section
Compressor
Section
Bi-flow liquid
line solenoid
Vapor Line
Oil Trap
(See Notes)
50 ft. max. lift
Vapor Line
Oil Trap
(See Notes)
Air Handler
Section
Notes:
• Crankcase heater and Bi-flow liquid line solenoid required if total equivalent length is greater
than or equal to 50 feet or the vertical separation is greater than or equal to 20 feet. See
tables below for descriptions and part numbers.
• A P-trap should be installed at the outlet of the evaporator section.
• If vertical separation is greater than or equal to 50 feet a second trap should be installed at
the 50 feet mark.
• 75 feet maximum equivalent line length
• 50 feet maximum vertical separation
• Vapor Line sizes on Two-stage units should not be increased due to the velocity requirements
for returning oil to the compressor.
• Two-stage units should have a maximum of 25 feet of vertical lift on the vapor line.
Crankcase Heater Data
Bi-flow Solenoid Data
Compatible Models
Part Number
Compatible Models
Description
Part Number
ST024-036
11490003001
All Split Models (24-72)
1/2” Valve Body
ARS-4A
ST048-072
11490003002
24V Coil
ARSCB
Bi-flow kit
ARSBK
*Only Required In Long Line Set Applications.
Only required in long line set applications. All three parts must be ordered.
ST Models, 05 Aug 2014G
35
Enertech Global
Section 9c: Line Set Installation
Figure 10: Horizontal piping above air handler section
Air Handler
Section
Vapor Line
Trap
Vapor Line
Trap
Compressor
Section
Bi-flow liquid
line solenoid
Notes:
• Crankcase heater and Bi-flow liquid line solenoid required if total equivalent length is greater
than or equal to 50 feet or the vertical separation is greater than or equal to 20 feet. See
tables below for descriptions and part numbers.
• The vapor line must be installed with the horizontal run higher than the top of the
evaporator section.
• P-traps should be installed at the outlet of the evaporator section and at the bottom of vapor
line drop.
• 75 feet maximum equivalent line length
• 50 feet maximum vertical separation
• Vapor Line sizes on Two-stage units should not be increased due to the velocity requirements
for returning oil to the compressor.
Crankcase Heater Data
Bi-flow Solenoid Data
Compatible Models
Part Number
Compatible Models
Description
Part Number
ST024-036
11490003001
All Split Models (24-72)
1/2” Valve Body
ARS-4A
ST048-072
11490003002
24V Coil
ARSCB
Bi-flow kit
ARSBK
*Only Required In Long Line Set Applications.
Only required in long line set applications. All three parts must be ordered.
Enertech Global
36
ST Models, 05 Aug 2014G
Section 9c: Line Set Installation
Figure 11: Horizontal piping above “A” coil
Vapor Line
Trap
“A” - Coil
Furnace
Vapor Line
Trap
Compressor
Section
Bi-flow liquid
line solenoid
Notes:
• Crankcase heater and Bi-flow liquid line solenoid required if total equivalent length is greater
than or equal to 50 feet or the vertical separation is greater than or equal to 20 feet. See
tables below for descriptions and part numbers.
• The vapor line must be installed with the horizontal run higher than the top of the
evaporator section.
• P-traps should be installed at the outlet of the evaporator section and at the bottom of vapor
line drop.
• 75 feet maximum equivalent line length
• 50 feet maximum vertical separation
• Vapor Line sizes on Two-stage units should not be increased due to the velocity requirements
for returning oil to the compressor.
Crankcase Heater Data
Compatible Models
Part Number
ST024-036
11490003001
ST048-072
11490003002
⚠ WARNING ⚠
*Only Required In Long Line Set Applications.
Bi-flow Solenoid Data
Compatible Models
Description
Part Number
All Split Models (24-72)
1/2” Valve Body
ARS-4A
24V Coil
ARSCB
Bi-flow kit
ARSBK
IF USING A DUAL FUEL APPLICATION, “A”
COIL MUST BE INSTALLED ON THE OUTLET
OF THE FURNACE. INSTALLATION ON THE
RETURN COULD CAUSE FURNACE HEAT
EXCHANGER FAILURE, AND MAY VOID
FURNACE WARRANTY.
Only required in long line set applications. All three parts
must be ordered.
ST Models, 05 Aug 2014G
37
Enertech Global
Section 10: Unit Piping Installation
Open Loop Piping
Placement of the components for an open
loop system are important when considering
water quality and long term maintenance. The
water solenoid valve should always be placed
on the outlet of the heat pump, which will keep
the heat exchanger under pressure when the
unit is not operating. If the heat exchanger is
under pressure, minerals will stay in suspension.
Water solenoid valves are also designed to
close against the pressure, not with the pressure.
Otherwise, they tend to be noisy when closing.
velocity noise. Always double check flow rate
at the P/T ports to make sure the ball valve
adjustments have not lowered water flow too
much, and essentially taken the flow regulator
out of the equation. It’s a good idea to remove
the ball valve handles once the system is
completed to avoid nuisance service calls.
A flow regulator should be placed after the
water solenoid valve. Always check the product
specification catalog for proper flow rate. A
calculation must be made to determine the
flow rate, so that the leaving water temperature
does not have the possibility of freezing.
Since the heat pump can operate at lower
waterflow on first stage, two stage units
typically include two water solenoid valves
to save water. The flow regulators should be
sized so that when one valve is open the unit
operates at first stage flow rate, and when
both valves are open, the unit operates at
full load flow rate. For example, a 4 ton unit
needs approximately 4 GPM on first stage, and
approximately 7 GPM at full load. The flow
regulator after the first valve should be 4 GPM,
and the flow regulator after the second valve
should be 3 GPM. When both valves are open,
the unit will operate at 7 GPM.
Other necessary components include a strainer,
boiler drains for heat exchanger flushing, P/T
ports and ball valves. Ball valves allow the
water to be shut off for service, and also help
when velocity noise is noticeable through the
flow regulator. Spreading some of the pressure
drop across the ball valves will lessen the
Hose kits are optional, but make for an easier
installation, since the P/T ports and connections
are included. The hose also helps to isolate the
heat pump from the piping system.
HEAT PUMP
Figure 12: Open Loop Piping Example
P/T Port
(2 required)
Ball Valve
(2 required)
Strainer
From Well
IN
Optional
Hose Kit*
S
OUT
Single
Speed
Units
Flow Regulator**
Discharge Line
Boiler Drain
for Heat
Exchanger
Maintenance
(2 required)
Enertech Global
S
Water
Solenoid
Valve
*Hose kit is used for piping
isolation, and includes
fittings for P/T ports.
**See product specification
catalog for flow rates.
S
38
TwoStage
Units
Note: All split units are twostage units.
Not recommended for
3 ton and smaller. Use
single solenoid and
flow regulator.
ST Models, 05 Aug 2014G
Section 10: Unit Piping Installation
Water Quality
The quality of the water used in geothermal
systems is very important. In closed loop systems
the dilution water (water mixed with antifreeze)
must be of high quality to ensure adequate
corrosion protection. Water of poor quality
contains ions that make the fluid “hard” and
corrosive. Calcium and magnesium hardness
ions build up as scale on the walls of the system
and reduce heat transfer. These ions may also
react with the corrosion inhibitors in glycol based
heat transfer fluids, causing them to precipitate
out of solution and rendering the inhibitors
ineffective in protecting against corrosion. In
addition, high concentrations of corrosive ions,
such as chloride and sulfate, will eat through any
protective layer that the corrosion inhibitors form
on the walls of the system.
Ideally, de-ionized water should be used for
dilution with antifreeze solutions since de-
ionizing removes both corrosive and hardness
ions. Distilled water and zeolite softened water
are also acceptable. Softened water, although
free of hardness ions, may actually have
increased concentrations of corrosive ions and,
therefore, its quality must be monitored. It is
recommended that dilution water contain less
than 100 PPM calcium carbonate or less than
25 PPM calcium plus magnesium ions; and less
than 25 PPM chloride or sulfate ions.
In an open loop system the water quality is
of no less importance. Due to the inherent
variation of the supply water, it should be tested
prior to making the decision to use an open
loop system. Scaling of the heat exchanger
and corrosion of the internal parts are two of
the potential problems. The Department of
Natural Resources or your local municipality
can direct you to the proper testing agency.
Please see Table 7 for guidelines.
Table 7: Water Quality
Potential
Problem
Chemical(s) or Condition
Range for Copper
Heat Exchangers
Range for Cupro-Nickel Heat
Exchangers
Scaling
Calcium & Magnesium Cabonate
Less than 350 ppm
Less than 350 ppm
Corrosion
Biological
Growth
Erosion
pH Range
7-9
5-9
Total Disolved Solids
Less than 1000 ppm
Less than 1500 ppm
Ammonia, Ammonium Hydroxide
Less than 0.5 ppm
Less than 0.5 ppm
Ammonium Chloride, Ammonium Nitrate
Less than 0.5 ppm
Less than 0.5 ppm
Calcium Chloride / Sodium Chloride
Less than 125 ppm
Less than 125 ppm - Note 4
Chlorine
Less than 0.5 ppm
Less than 0.5 ppm
Hydrogen Sulfide
None Allowed
None Allowed
Iron Bacteria
None Allowed
None Allowed
Iron Oxide
Less than 1 ppm
Less than 1 ppm
Suspended Solids
Less than 10 ppm
Less than 10 ppm
Water Velocity
Less than 8 ft/s
Less than 12 ft/s
Notes:
1. Harness in ppm is equivalent to hardness in mg/l
2. Grains/gallon = ppm divided by 17.1
3. Copper and cupro-nickel heat exchangers are not recommended for pool applications for water outside the range of the table.
Secondary heat exchangers are required for applications not meeting the requirements shown above.
4. Saltwater applications (approx. 25,000 ppm) require secondary heat exchangers due to copper piping between the heat exchanger
and the unit fittings.
ST Models, 05 Aug 2014G
39
Enertech Global
Section 10: Unit Piping Installation
Interior Piping
All interior piping must be sized for proper flow
rates and pressure loss. Insulation should be
used on all inside piping when minimum loop
temperatures are expected to be less than
50°F. Use the table below for insulation sizes with
different pipe sizes. All pipe insulation should
be a closed cell and have a minimum wall
thickness of 3/8”. All piping insulation should
be glued and sealed to prevent condensation
and dripping. Interior piping may consist of the
following materials: HDPE, copper, brass, or
rubber hose (hose kit only). PVC is not allowed
on pressurized systems.
Table 8: Pipe Insulation
Piping Material
Insulation Description
1” IPS PE
1-1/4” ID - 3/8” Wall
1” IPS Hose
1-1/4” IPS PE
2” IPS PD
Typical Pressurized Flow Center Installation
The flow centers are insulated and contain
all flushing and circulation connections
for residential and light commercial earth
loops that require a flow rate of no more
than 20 gpm. 1-1/4” fusion x 1” double
o-ring fittings (AGA6PES) are furnished with
the double o-ring flow centers for HDPE
loop constructions. Various fittings are
available for the double o-ring flow centers
for different connections. See figure 13 for
connection options. A typical installation
will require the use of a hose kit. Matching
hose kits come with double o-ring adapters
to transition to 1” hose connection.
1-3/8” ID - 3/8” Wall
1-5/8” ID - 3/8” Wall
2-1/8” ID - 3/8” Wall
Figure 13: Typical Single Unit Piping Connection (Pressurized Flow Center)
Flow
Center
Hose
Kit
~~
To/From
Loop Field
Enertech Global
P/T Ports
40
Source Water In
GSHP
Source Water Out
ST Models, 05 Aug 2014G
Section 10: Unit Piping Installation
Typical Non-Pressurized Flow Center Installation
Standing column flow centers are designed to
operate with no static pressure on the earth
loop. The design is such that the column of
water in the flow center is enough pressure to
prime the pumps for proper system operation
and pump reliability. The flow center does have
a cap/seal, so it is still a closed system, where the
fluid will not evaporate. If the earth loop header
is external, the loop system will still need to be
flushed with a purge cart. The non-pressurized
flow center needs to be isolated from the flush
cart during flushing because the flow center
is not designed to handle pressure. Since this
is a non-pressurized system, the interior piping
can incorporate all the above-mentioned pipe
material options (see interior piping), including
PVC. The flow center can be mounted to the
wall with the included bracket or mounted on
the floor as long as it is properly supported.
Figure 14: Typical Single Unit Piping Connection (Non-Pressurized Flow Center)
ST Models, 05 Aug 2014G
41
Enertech Global
Section 10: Unit Piping Installation
Condensation Drain Connection
Connect the EZ-Trap to the condensate drain
on the equipment drain connection. The
condensation line must be trapped a minimum
of 1.0” as shown on diagram. The condensation
line should be pitched away from the unit
a minimum of 1/4” per foot. The top of trap
must be below the drain connection. For more
information on installing EZ-Trap, see installation
sheet that comes with the EZ-Trap Kit. Always
install the air vent after the trap.
Note: Connect the drain through the trap to
the condensation drain system in conformance
to local plumbing codes.
Part Number Description
ACDT1A
EZ-Trap ¾” Kit
ACDT2A
EZ-Trap 1” Kit
Figure 15: Condensation Drain Connection
Cleaning Holes (Capped)
Vent
1.0"
2.5"
1/4" per foot
Secondary drain pan (Horizontal Untis)
Enertech Global
42
ST Models, 05 Aug 2014G
Section 11: Antifreeze
Convenience: Is the antifreeze available and
easy to transport and install?
Antifreeze Overview
In areas where minimum entering loop
temperatures drop below 40°F, or where piping
will be routed through areas subject to freezing,
antifreeze is required. Alcohols and glycols
are commonly used as antifreeze. However,
local and state/provincial codes supersede
any instructions in this document. The system
needs antifreeze to protect the coaxial heat
exchanger from freezing and rupturing.
Freeze protection should be maintained to
15°F below the lowest expected entering
source loop temperature. For example, if 30°F
is the minimum expected entering source
loop temperature, the leaving source loop
temperature could be 22 to 25°F. Freeze
protection should be set at 15°F (30-15 =
15°F). To determine antifreeze requirements,
calculate how much volume the system holds.
Then, calculate how much antifreeze will
be needed by determining the percentage
of antifreeze required for proper freeze
protection. See Tables 9 and 10 for volumes
and percentages. The freeze protection should
be checked during installation using the proper
hydrometer to measure the specific gravity and
freeze protection level of the solution.
Codes: Will the brine meet local and state/
provincial codes?
The following are some general observations
about the types of brines presently being used:
Methanol: Wood grain alcohol that is
considered toxic in pure form. It has good heat
transfer, low viscosity, is non-corrosive, and is mid
to low price. The biggest down side is that it is
flammable in concentrations greater than 25%.
Ethanol: Grain alcohol, which by the ATF
(Alcohol, Tobacco, Firearms) department
of the U.S. government, is required to be
denatured and rendered unfit to drink. It has
good heat transfer, mid to high price, is noncorrosive, non-toxic even in its pure form, and
has medium viscosity. It also is flammable with
concentrations greater than 25%. Note that
the brand of ethanol is very important. Make
sure it has been formulated for the geothermal
industry. Some of the denaturants are not
compatible with HDPE pipe (for example,
solutions denatured with gasoline).
Antifreeze Characteristics
Selection of the antifreeze solution for closed
loop systems require the consideration of
many important factors, which have long-term
implications on the performance and life of
the equipment. Each area of concern leads to
a different “best choice” of antifreeze. There
is no “perfect” antifreeze. Some of the factors
to consider are as follows (Brine = antifreeze
solution including water):
Safety: The toxicity and flammability of the brine
(especially in a pure form).
Cost: Prices vary widely.
Thermal Performance: The heat transfer and
viscosity effect of the brine.
Corrosiveness: The brine must be compatible
with the system materials.
Stability: Will the brine require periodic change
out or maintenance?
ST Models, 05 Aug 2014G
Propylene Glycol: Non-toxic, non-corrosive,
mid to high price, poor heat transfer, high
viscosity when cold, and can introduce micro
air bubbles when adding to the system. It
has also been known to form a “slime-type”
coating inside the pipe. Food grade glycol is
recommended because some of the other
types have certain inhibitors that react poorly
with geothermal systems. A 25% brine solution is
a minimum required by glycol manufacturers,
so that bacteria does not start to form.
Ethylene Glycol: Considered toxic and is not
recommended for use in earth loop applications.
GS4 (POTASSIUM ACETATE): Considered highly
corrosive (especially if air is present in the
system) and has a very low surface tension,
which causes leaks through most mechanical
fittings. This brine is not recommended for use in
earth loop applications.
43
Enertech Global
Section 11: Antifreeze
Table 9: Pipe Fluid Volume
Notes:
1. Consult with your representative or
distributor if you have any questions
regarding antifreeze selection or use.
2. All antifreeze suppliers and manufacturers
recommend the use of either de-ionized or
distilled water with their products.
Type
Copper
1” CTS
Volume Per 100ft
US Gallons
4.1
Copper
1.25” CTS
HDPE
.75” SDR11
3.0
HDPE
1.25” SDR11
7.5
HDPE
2” SDR11
Copper
Antifreeze Charging
Calculate the total amount of pipe in the
system and use Table 9 to calculate the
amount of volume for each specific section of
the system. Add the entire volume together,
and multiply that volume by the proper
antifreeze percentage needed (Table 8) for the
freeze protection required in your area. Then,
double check calculations during installation
with the proper hydrometer and specific gravity
chart (Figure 16) to determine if the correct
amount of antifreeze was added.
Size
HDPE
HDPE
1.5” CTS
1” SDR11
1.5” SDR11
6.4
9.2
4.7
9.8
15.4
Additional component volumes:
Unit coaxial heat exchanger = 1 Gallon
Flush Cart = 8-10 Gallons
10’ of 1” Rubber Hose = 0.4 Gallons
⚠ CAUTION ⚠
USE EXTREME CARE WHEN OPENING,
POURING, AND MIXING FLAMMABLE
ANTIFREEZE SOLUTIONS. REMOTE FLAMES
OR ELECTRICAL SPARKS CAN IGNITE
UNDILUTED ANTIFREEZES AND VAPORS.
USE ONLY IN A WELL VENTILATED AREA.
DO NOT SMOKE WHEN HANDLING
FLAMMABLE SOLUTIONS. FAILURE TO
OBSERVE SAFETY PRECAUTIONS MAY
RESULT IN FIRE, INJURY, OR DEATH. NEVER
WORK WITH 100% ALCOHOL SOLUTIONS.
Enertech Global
44
ST Models, 05 Aug 2014G
Section 11: Antifreeze
Table 10 Antifreeze Percentages by Volume
Type of Antifreeze
10°F (-12.2°C)
ProCool (Ethanol)
25%
Methanol
Minimum Temperature for Freeze Protection
15°F (-9.4°C)
20°F (-6.7°C)
25°F (-3.9°C)
21%
16%
10%
22%
25%
Propylene Glycol
38%
Heat Transfer Fluid (HTF)
17%
30%
12%
22%
15%
Mix according to manufacturer’s directions on container label
Antifreeze solutions are shown in pure form - not premixed
HTF is a premixed Methanol solution
NOTE: Most manufacturers of antifreeze
solutions recommend the use of de-ionized
water. Tap water may include chemicals that
could react with the antifreeze solution.
Figure 16: Antifreeze Specific Gravity
1.0500
1.0400
1.0300
Specific Gravity
1.0200
1.0100
1.0000
0.9900
0.9800
0.9700
0.9600
-5
0
5
10
15
20
25
30
32
Freeze Protection (deg F)
Procool
ST Models, 05 Aug 2014G
Methanol
45
Propylene Glycol
Enertech Global
Section 12: Desuperheater Installation
Desuperheater Installation
Units that ship with the desuperheater function
also ship with a connection kit.
Plumbing Installation
NOTE: All plumbing and piping connections
must comply with local plumbing codes.
Note: Desuperheater capacity is based on 0.4
GPM Flow per nominal ton at 90°F entering hot
water temperature.
Note: Units that are shipped with a
desuperheater do not have the desuperheater
pump wires connected to the electrical circuit,
to prevent accidentally running the pump while
dry. Pump has to be connected to the electric
circuit (master contactor) when the lines from
the water heater are installed & air
is removed.
CONTENTS OF THE DESUPERHEATER FITTING KIT,
P/N 11080008001:
• (1) p/n 23-23-0024-001, Installation
Instructions
• (1) p/n 11-08-0004-001, 3/4”x 3/4”x 3/4” FPT
Brass Tee
• (1) p/n 11-08-0003-001, ¾” Boiler
Drain Valve
• (1) p/n 11-08-0005-001, ¾” MPT x 3-1/2” Brass
Nipple
• (3) p/n 11-08-0006-001, ½” SWT x ¾” MPT
Copper Adaptor
• (1) p/n 11-08-0007-001, ¾” x ¾” x ½” SWT
Copper Tee
TIP: Measure the distance above the floor or
shelf that the water heater is setting on, to
where the drain valve is located. This distance
must be greater than one-half the width of the
tee you’re about to install, or you won’t be able
to thread the tee on to the water heater.
Note: Copper is the only approved material for
piping the desuperheater.
1. Disconnect electricity to water heater.
2. Turn off water supply to water heater.
3. Drain water heater. Open pressure
relief valve.
4. Remove drain valve and fitting from
water heater.
5. Thread the ¾” MPT x 3-1/2” nipple into the
water heater drain port. Use Teflon tape, or
pipe thread sealant on threads.
6. Thread the branch port of the ¾” brass tee
to the other end of the nipple.
7. Thread one of the copper adaptors into the
end of the tee closest to the heat pump.
⚠ WARNING ⚠
TO AVOID SERIOUS INJURY, IT IS
RECOMMENDED THAT AN ANTI-SCALD
MIXING VALVE IS INSTALLED ON THE HOT
WATER SUPPLY LINE INTO THE HOME. EVEN
THOUGH HOT WATER TANK TEMPERATURES
COULD APPEAR TO BE SET AT LOWER
LEVELS, HIGH TEMPERATURE WATER FROM
THE DESUPERHEATER COULD RAISE TANK
TEMPERATURES TO UNSAFE LEVELS.
Enertech Global
8. Thread the drain valve into the other end of
the nipple. See Figure 17.
9. Above the water heater, cut the incoming
cold water line. Remove a section of
that line to enable the placement of the
copper tee.
10. Insert the copper tee in the cold water line.
See Figure 18.
11. Thread the remaining two ½”SWT x ¾”MPT
copper adaptors into the ¾” FPT fittings on
the heat pump, marked HOT WATER IN and
HOT WATER OUT.
46
ST Models, 05 Aug 2014G
Section 12: Desuperheater Installation
12. Run interconnecting ½” copper pipe from
the HOT WATER OUT on the heat pump, to
the copper adaptor located on the tee at
the bottom of the water heater (Step 7).
16. Turn the water supply to the water heater
on. Fill water heater. Open highest hot water
faucet to purge air from tank and piping.
17. Flush the interconnecting lines, and check
for leaks. Make sure air vent is shutoff when
water begins to drip steadily from the vent.
13. Run interconnecting ½” copper pipe from
the HOT WATER IN on the heat pump, to the
copper tee in the cold water line (Step 10).
18. Loosen the screw on the end of the
desuperheater pump to purge the air from
the pump’s rotor housing. A steady drip of
water will indicate the air is removed. Tighten
the screw and the pump can be connected
to the contactor or terminal block.
14. Install an air vent fitting at the highest point
of the line from step 13 (assuming it’s the
higher of the two lines from the heat pump
to the water heater). See Figure 18.
15. Shut off the valve installed in the
desuperheater line close to the tee in the
cold water line. Open the air vent and all
shut off valves installed in the “hot water out”.
19. Install 3/8” closed cell insulation on the
lines connecting the heat pump to the
water heater.
20. Reconnect electricity to water heater.
Figure 17: Water Heater Connection Kit
Assembly for Bottom of Water Heater
NOTE: Drawing shown vertically for detail.
Fitting installs horizontally into hot water tank.
Connection to Hot
Water Tank
Copper Tee
For Domestic
Cold Water
In Line
Drain
Brass Tee
Adapter to Unit
Water Line
ST Models, 05 Aug 2014G
47
Enertech Global
Section 12: Desuperheater Installation
Figure 18: Typical Desuperheater Installation
Cold Water
Hot Water Supply
Shutoff
Valves
Air Vent
Located at
System
High Point
Water Heater
(or Storage Tank)
Heat Pump
Drain
Valve
Shutoff
Valves
Desuperheater Out
Desuperheater In
Figure 19: Desuperheater Installation and Preheat Tank
Hot Water
Cold Water
Supply
Water Heater No. 2
(or Storage Tank)
Cold Water
Supply
Shutoff
Valves
Hot Water
Air Vent
Located at
System
High Point
Water Heater No. 1
(or Storage Tank)
Heat Pump
Drain
Valve
Enertech Global
Drain
Valve
Shutoff
Valves
Desuperheater Out
Desuperheater In
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ST Models, 05 Aug 2014G
Section 13: Controls
Loop Pump Circuit Breakers
(Single Compressor Units)
The loop pump(s) and desuperheater pump
are protected by control box mounted circuit
breakers for easy wiring of pumps during
installation. Circuit breakers eliminate the need
to replace fuses.
MICROPROCESSOR FEATURES AND OPERATION
Enertech Global geothermal heat pump
controls provide a unique modular approach
for controlling heat pump operation. The
control system uses one, two, or three printed
circuit boards, depending upon the features
of a particular unit. This approach simplifies
installation and troubleshooting, and eliminates
features that are not applicable for some units.
Split units include only the lockout board in the
compressor section.
A microprocessor-based printed circuit board
controls the inputs to the unit as well as outputs
for status mode, faults, and diagnostics. A
status LED and an LED for each fault is provided
for diagnostics. Removable low voltage
terminal strips provide all necessary terminals
for field connections.
Startup/Random Start
The unit will not operate until all the inputs
and safety controls are checked for normal
conditions. At first power-up, the compressor is
energized after a five minute delay. In addition,
a zero to sixty second random start delay is
added at first power-up to avoid multiple units
from being energized at the same time.
Low Pressure: If the low pressure switch is open
for 30 continuous seconds, the compressor
operation will be interrupted, and the control
will go into fault retry mode. At startup, the low
pressure switch is not monitored for 90 seconds
to avoid nuisance faults.
Short Cycle Protection
A built-in five minute anti-short cycle timer
provides short cycle protection of the compressor.
Component Sequencing Delays
Components are sequenced and delayed for
optimum space conditioning performance and
to make any startup noise less noticeable.
Test Mode
The microprocessor control allows the
technician to shorten most timing delays for
faster diagnostics by changing the position of a
jumper located on the lockout board.
Water Solenoid Valve Connections
Two accessory relay outputs at the terminal
strip provide a field connection for two types
of water solenoid valves, a standard 24VAC
solenoid valve, or a 24VAC solenoid valve
with an end switch. Additional field wiring is no
longer required for operation of the end switch.
ST Models, 05 Aug 2014G
Safety Controls
The control receives separate signals for
high pressure, low pressure, low water flow,
and condensate overflow faults. Upon a
continuous 30-second measurement of the
fault (immediate for high pressure), compressor
operation is suspended (see Fault Retry below),
and the appropriate LED flashes. Once the unit
is locked out (see Fault Retry below), an output
(terminal “L”) is made available to a fault LED
at the thermostat (water-to-water unit has fault
LED on the corner post).
High Pressure: If the high pressure switch
opens, the compressor operation will be
interrupted, and the control will go into fault
retry mode. There is no delay from the time the
switch opens and the board goes into fault
retry mode. There is also no delay of switch
monitoring at startup.
Flow Switch: If the flow switch is open for 30
continuous seconds, the compressor operation
will be interrupted, and the control will go into
fault retry mode. At startup, the flow switch
is not monitored for 30 seconds to avoid
nuisance faults.
FAULT RETRY
All faults are retried twice before finally locking
the unit out. The fault retry feature is designed to
prevent nuisance service calls. There is an antishort cycle period between fault retries. On the
third fault, the board will go into lockout mode.
49
Enertech Global
Section 13: Controls
Over/Under Voltage Shutdown
The lockout board protects the compressor
from operating when an over/under voltage
condition exists. The control monitors secondary
voltage (24VAC) to determine if an over/
under voltage condition is occurring on the
primary side of the transformer. For example, if
the secondary voltage is 19 VAC, the primary
voltage for a 240V unit would be approximately
190V, which is below the minimum voltage (197V)
recommended by the compressor manufacturer.
This feature is self-resetting. If the voltage comes
back within range, normal operation is restored.
Therefore, over/under voltage is not a lockout.
Under voltage (18 VAC) causes the compressor
to disengage and restart when the voltage
returns to 20 VAC. Over voltage (31 VAC)
causes the compressor to disengage and
restart when the voltage returns to 29 VAC.
During an over or under voltage condition,
all five fault LEDs will blink (HP + LP + FS + CO
+ Status). When voltage returns to normal
operation, the four fault LED’s will stop blinking,
but the status LED will continue to flash. While
the board LEDs are flashing, the thermostat
fault light will be illuminated.
Intelligent Reset
If the thermostat is powered off and back
on (soft reset), the board will reset, but the
last fault will be stored in memory for ease of
troubleshooting. If power is interrupted to the
board, the fault memory will be cleared.
Diagnostics
The lockout board includes five LEDs (status,
high pressure, low pressure, low water flow,
condensate overflow) for fast and simple
control board diagnosis. On the following page
is a table showing LED function.
NOTE: Condensate overflow is not used for split
systems. Any condensate overflow protection
must be added to the air handler.
Enertech Global
Hot Water Pump Control
Controls for high water temperature and low
compressor discharge line temperature prevent
the hot water (desuperheater) pump from
operating when the leaving water temperature
is above 130°F, or when the compressor
discharge line is too cool to provide adequate
water heating.
Lockout Board Jumper Selection
The lockout board includes three jumpers for
field selection of various board features.
Water Solenoid Valve Delay (WSD): When
the WSD jumper is installed, the “A” terminal is
energized when the compressor is energized.
When the jumper is removed, the “A” terminal
is energized 10 seconds after the compressor.
If using the Taco water solenoid valve (or a
valve with an end switch), the unit terminal strip
includes a means for connecting a valve of this
type. The WSD jumper should be installed. If
using a fast opening valve that does not have
an end switch, the jumper should be removed.
Test Mode (TEST): When the TEST jumper is
installed, the board operates in the normal
mode. When the jumper is removed, the board
operates in test mode, which speeds up all
delays for easier troubleshooting. When service
is complete, the jumper must be re-installed in
order to make sure that the unit operates with
normal sequencing delays.
Over/Under Voltage Disable (O/V): When the
O/V jumper is installed, the over/under voltage
feature is active. When the jumper is removed,
the over/under voltage feature is disabled. On
rare occasions, variations in voltage will be
outside the range of the over/under voltage
feature, which may require removal of the
jumper. However, removal of the jumper could
cause the unit to run under adverse conditions,
and therefore should not be removed without
contacting technical services. An over/under
voltage condition could cause premature
component failure or damage to the unit
controls. Any condition that would cause this
fault must be thoroughly investigated before
taking any action regarding the jumper removal.
Likely causes of an over/under voltage condition
include power company transformer selection,
50
ST Models, 05 Aug 2014G
Section 13: Controls
Table 11a: LED Identification
LED Color
Location1
Function
Normal Operation
Fault Retry2
Lockout2
Green
Top
High Pressure
OFF
Flashing3
ON3
Orange
2nd
Low Pressure
OFF
Flashing3
ON3
Red
3rd
Water Flow
OFF
Flashing
3
ON3
Yellow
4th
Condensate*
Overflow
OFF
Flashing3
ON3
Green
Bottom
Status
Flashing4
Flashing5
Flashing4
Notes:
1. Looking at the board when the LEDs are on the right hand side
2. If all five lights are flashing, the fault is over/under voltage
3. Only the light associated with the particular fault/lockout will be on or flashing.
For example, if a high pressure lockout has occurred, the top green light will be on.
The orange, red, and yellow lights will be off
4. Status lights will be off when tin test mode
5. Flashes alternately with the fault LED
* Not applicable in split units
insufficient entrance wire sizing, defective
breaker panel, incorrect transformer tap (unit
control box), or other power-related issues.
SEQUENCE OF OPERATION
Water-to-Air Units, Single Compressor, ECM Fan
Heating, 1st Stage (Y1,G)
The ECM fan is started immediately at 75%
(of 1st stage operation) CFM level, first stage
compressor and the loop/desuperheater
pump(s) are energized 10 seconds after the
“Y1” input is received, and the ECM fan adjusts
to 100% (of 1st stage operation) CFM level 30
seconds after the “Y1” input.
Heating, 2nd Stage (Y1,Y2,G)
The ECM fan adjusts to 2nd stage CFM level,
and the compressor full load solenoid valve
is energized.
Heat, 3rd Stage (Y1,Y2,W,G)
The ECM fan remains at 100% of 2nd stage CFM
level, and the electric backup heat is energized.
Emergency Heat (W,G)
The fan is started immediately at 100% of 2nd
stage CFM level, and the electric backup heat
is energized.
Cooling, 1st stage (Y1,0,G) Two-Stage Units
The ECM fan is started immediately at 75%
(of 1st stage operation) CFM level, first stage
compressor and the loop/desuperheater
pump(s) are energized 10 seconds after the
“Y1” input is received, and the ECM fan adjusts
to 100% (of 1st stage operation) CFM level 30
seconds after the “Y1” input.
Cooling, 2nd Stage (Y1,Y2,O,G)
The ECM fan adjusts to 2nd stage CFM level,
and the compressor full load solenoid valve
is energized.
Fan Only
When the ECM control module receives a “G”
call without a call for heating or cooling, the
fan operates at 50% of the full load CFM level.
Thermostat Wiring / Fan Speed Notes
For two-stage compressor section units, wire as
shown in the wiring diagram on the following
page. For single stage units, jumper Y1 and Y2,
and use the “CFM Y2” column in table 9b for
determining jumper location. The ECM control
board in the air handler is the thermostat
connection point. Wire nut the thermostat
wiring to the “pigtails” connected to the 1/4”
spades on the ECM board.
Cooling Operation
The reversing valve is energized for cooling
operation. Terminal “O” from the thermostat is
connected to the reversing valve solenoid.
ST Models, 05 Aug 2014G
51
Enertech Global
Section 13: Controls
For dehumidification in cooling, cut the resistor
at the “DEHUMIDIFY” LED. Use either the HUM
terminal (reverse logic -- designed to be used
with a humidistat) to lower the fan speed when
dehumidification is needed, or if the HUM
terminal is not connected (and the resistor is cut),
the air handler will operate at a lower fan speed
in cooling and normal fan speed in heating.
Figure 21: ECM Board (Air Handler Section)
CUT TO ENABLE
DEHUMIDIFY
D
C
B
A
COOL
Lockout
Board
A
C
R
Y
L
O
WSD
TEST
O/V
Enertech Global
CFM
ADJUST
Low Voltage
Connection
to ECM Motor
R2 R1 C2 C1
CC
HEAT
TEST
(-)
(+)
NORM
ECM Control Board
(MPD series)
Figure 20: Lockout Board (Compr Section)
CCG
D
C
B
A
G
Y1
Y2
O
W1
EM
C1
R
HUM
HP
HP
LP
LP
FS
FS
CO
CO
Status
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Section 13: Controls
Table 11b: MPD Air Handler Fan Speeds
Model Number
ST024 with MPD024A
Ships Set On:
COOL Jumper A
HEAT Jumper A
ADJUST Jumper Norm
ST036 with MPD036A
Ships Set On:
COOL Jumper C
HEAT Jumper C
ADJUST Jumper Norm
ST048 with MPD060B
Change to:
COOL Jumper C
HEAT Jumper C
ADJUST Jumper Norm
ST060 with MPD060B
Ships Set On:
COOL Jumper B
HEAT Jumper B
ADJUST Jumper Norm
ST072 with MPD072A
Ships Set On:
COOL Jumper C
HEAT Jumper C
ADJUST Jumper Norm
COOL
Jumper
HEAT
Jumper
ADJUST
Jumper
High SPD CFM Y2
.40”
.60”
.80”
Low SPD CFM Y1
.40”
.60”
.80”
FAN G
.40”
.60”
.80”
A
A
Norm
930
930
920
830
820
810
420
410
410
B
B
Norm
930
920
890
770
750
730
380
370
360
C
C
Norm
870
860
820
710
700
670
360
350
330
D
D
Norm
870
840
810
700
680
650
350
340
330
A
A
+
930
930
920
930
930
920
470
460
460
B
B
+
930
930
900
880
860
830
440
430
420
C
C
+
930
930
890
810
800
760
410
400
380
D
D
+
930
930
890
800
780
750
400
390
370
A
A
Norm
1556
1556
1508
1448
1448
1428
567
539
502
B
B
Norm
1547
1547
1518
1239
1239
1227
476
433
407
C
C
Norm
1312
1308
1308
1012
1006
1006
396
349
302
D
D
Norm
1150
1145
1139
880
873
865
322
288
N/A
A
A
+
1556
1556
1508
1566
1566
1518
674
633
619
B
B
+
1547
1547
1518
1428
1428
1428
558
529
493
C
C
+
1528
1520
1486
1156
1156
1156
450
404
377
D
D
+
1317
1317
1317
1024
1020
1006
395
345
302
A
A
Norm
2180
2170
2116
1810
1810
1784
1157
1137
1137
B
B
Norm
2015
2015
2004
1678
1678
1664
1087
1087
1045
C
C
Norm
1710
1701
1693
1407
1407
1396
953
934
905
D
D
Norm
1567
1567
1546
1318
1304
1274
911
989
962
A
A
+
2243
2170
2116
1885
1860
1823
1289
1271
1253
B
B
+
2232
2170
2105
1897
1873
1848
1215
1203
1191
C
C
+
1937
1921
1914
1612
1612
1603
1032
1017
981
D
D
+
1809
1795
1752
1493
1488
1467
1003
978
945
A
A
Norm
2511
2511
2498
2511
2511
2498
1298
1298
1274
B
B
Norm
2498
2461
2422
2344
2344
2330
1160
1160
1140
C
C
Norm
2076
2068
2054
1532
1522
1503
694
621
534
D
D
Norm
1848
1848
1832
1330
1330
1307
566
463
415
2511
2448
2572
2448
1391
1391
1368
Not Available
A
A
+
B
B
+
2572
C
C
+
2383
2370
2357
1784
1749
1731
818
764
694
D
D
+
2155
2133
2122
1544
1524
1499
715
640
543
2511
NOTES:
1. Dehumidification mode can be enabled by cutting the jumper on the ECM board. When cut, cooling CFM is reduced by 15%, and
heating/auxiliary heat CFM remains unchanged. Example: Model 036 with HEAT and COOL jumpers on C setting and ADJUST
jumper on Norm setting would run at 1115 CFM with jumper cut, instead of 1308 CFM with jumper intact.
1. Gray shaded areas are recommended settings. Other settings may be used, depending upon application. DO NOT cut
dehumidification jumper if CFM setting will cause airflow to be below 250 CFM per ton on first stage, and below 325 CFM per ton
on second stage. Example: Model 036 should not run below 750 CFM in first stage, or below 975 CFM in second stage. 2. The COOL and HEAT jumpers should both be set at the same position. COOL controls heating and cooling airflow; HEAT
controls electric heat airflow.
3. Above CFM will be maintained up to 0.50” ESP for models MPD024 and 036, and up to 0.75” ESP for models MPD048 and 60.
ST Models, 05 Aug 2014G
53
Enertech Global
Section 13: Controls
(Wire nut in air handler control box)
Enertech Global
54
ST Models, 05 Aug 2014G
(Wire nut in air handler control box)
Section 13: Controls
ST Models, 05 Aug 2014G
55
Enertech Global
Section 13: Wiring Diagrams - AH Electric Heat: MPD024-036 - 10kw
T-STAT CONNECTIONS
Enertech Global
56
ST Models, 05 Aug 2014G
Section 13: Wiring Diagrams - AH Electric Heat: MPD042-072 - 10kw
T-STAT CONNECTIONS
ST Models, 05 Aug 2014G
57
Enertech Global
Section 13: Wiring Diagrams - AH Electric Heat: MPD060-072 - 15kw
T-STAT CONNECTIONS
Enertech Global
58
ST Models, 05 Aug 2014G
Section 13: Wiring Diagrams - AH Electric Heat: MPD060-072 - 20kw
T-STAT CONNECTIONS
ST Models, 05 Aug 2014G
59
Enertech Global
Section 14: Accessories
APSMA PUMP SHARING MODULE
The pump sharing module, part number APSMA, is designed to allow two units to share one
flow center. With the APSMA module, either
unit can energize the pump(s). Connect the
units and flow center as shown in Figure 22,
below. Figure 23 includes a schematic of the
board. The module must be mounted in a
NEMA enclosure or inside the unit control box.
Local code supersedes any recommendations
in this document.
igure 1: Board
Layout
Figure
22: APSMA Module Layout
240VAC
to Pump(s)
240VAC
Power Source
240V IN 240V OUT
Relay
24VAC
connection
to unit #1
Relay
24VAC
connection
to unit #2
24VAC 24VAC
(Y1 & C From Thermostat)
(Y1 & C From Thermostat)
igure 2: Board
Schematic
Figure
23: APSMA Module Wiring Schematic
DC
Bridge
24VAC input
from unit #1
24VAC input
from unit #2
+
-
LED
Diode
RY1
RY1
240VAC input
RY2
+
-
Diode
Enertech Global
RY2
240VAC to pump(s)
60
ST Models, 05 Aug 2014G
Section 15: Troubleshooting
PERFORMANCE CHECK
Heat of Extraction(HE)/Rejection(HR)
Record information on the Unit Start-up Form
Equipment should be in full load operation for
a minimum of 10 minutes in either mode – WITH
THE HOT WATER GENERATOR TURNED OFF.
1. Determine flow rate in gallons per minute
a. Check entering water temperature
b. Check entering water pressure
c. Check leaving water pressure
Once this information is recorded, find
corresponding entering water temperature
column in Specification Manual for unit.
Find pressure differential in PSI column in Spec
Manual. Then read the GPM column in Spec
Manual to determine flow in GPM.
2. Check leaving water temperature of unit.
FORMULA: GPM x water temp diff, x 485
(antifreeze) or 500 (fresh water) = HE or HR in
BTU/HR
A 10% variance from Spec Manual is allowed.
Always use the same pressure gauge &
temperature measuring device.
Water flow must be in range of Specification
Manual. If system has too much water flow,
performance problems should be expected
ST Models, 05 Aug 2014G
61
Enertech Global
Section 15: Troubleshooting
A: UNIT WILL NOT START IN EITHER CYCLE
Thermostat
Set thermostat on heating and highest temperature setting. Unit should run. Set thermostat on cooling and
lowest temperature setting. Unit should run. Set fan to On position. Fan should run. If unit does not run in
any position, disconnect wires at heat pump terminal block and jump R, G, Y. Unit should run in heating. If
unit runs, replace thermostat with correct thermostat only.
Loose or broken wires
Tighten or replace wires.
Blown Fuse/
Tripped Circuit Breakers
Check fuse size, replace fuse or reset circuit breaker.
Check low voltage circuit breaker.
Low Voltage Circuit
Check 24 volt transformer. If burned out or less than 24 volt, replace. Before replacing, verify tap setting
and correct if necessary.
Water Flow
If water flow is low (less than 3.5 GPM), unit will not start. Make sure Pump Module or solenoid valve is
connected (see wiring diagram). Water has to flow through the heat exchanger in the right direction (see
labels at water fitting connections) before the compressor can start. If water flow is at normal flow, use an
ohmmeter to check if you get continuity at the flow switch. If no switch is open and flow is a normal flow,
remove switch and check for stuck particles or bad switch.
B: UNIT RUNNING NORMAL, BUT SPACE TEMPERATURE IS UNSTABLE
Thermostat
Thermostat is getting a draft of cold or warm air. Make sure that the wall or hole used to run thermostat
wire from the ceiling or basement is sealed, so no draft can come to the thermostat.
Faulty Thermostat (Replace).
C: NO WATER FLOW
Pump Module
Make sure Pump Module is connected to the control box relay (check all electrical connections). For nonpressurized systems, check water level in Pump Module. If full of water, check pump. Close valve on the
pump flanges and loosen pump. Take off pump and see if there is an obstruction in the pump. If pump is
defective, replace. For pressurized systems, check loop pressure. Repressurize if necessary. May require
re-flushing if there is air in the loop.
Solenoid valve
Make sure solenoid valve is connected. Check solenoid. If defective, replace.
D: IN HEATING OR COOLING MODE, UNIT OUTPUT IS LOW
Water
Water flow & temperature insufficient.
Airflow
Check speed setting, check nameplate or data manual for proper speed, and correct speed setting.
Check for dirty air filter—Clean or replace.
Restricted or leaky ductwork. Repair.
Refrigerant charge
Refrigerant charge low, causing inefficient operation. Make adjustments only after airflow and water flow
are checked.
Reversing valve
Defective reversing valve can create bypass of refrigerant to suction side of compressor. Switch reversing
valve to heating and cooling mode rapidly. If problem is not resolved, replace valve. Wrap the valve with a
wet cloth and direct the heat away from the valve. Excessive heat can damage the valve. Always use dry
nitrogen when brazing. Replace filter/drier any time the circuit is opened.
E: IN HEATING OR COOLING MODE, UNIT OUTPUT IS LOW
Heat pump will not cool but will
heat. Heat pump will not heat
but will cool.
Reversing valve does not shift. Check reversing valve wiring. If wired wrong, correct wiring. If reversing
valve is stuck, replace valve. Wrap the valve with a wet cloth and direct the heat away from the valve.
Excessive heat can damage the valve. Always use dry nitrogen when brazing. Replace filter/drier any time
the circuit is opened.
Water heat exchanger
Check for high-pressure drop, or low temperature drop across the coil. It could be scaled. If scaled, clean
with condenser coil cleaner.
System undersized
Recalculate conditioning load.
F: WATER HEAT EXCHANGER FREEZES IN HEATING MODE
Water flow
Low water flow. Increase flow. See F. No water flow.
Flow Switch
Check switch. If defective, replace.
G: EXCESSIVE HEAD PRESSURE IN COOLING MODE
Inadequate water flow
Enertech Global
Low water flow, increase flow.
62
ST Models, 05 Aug 2014G
Section 15: Troubleshooting
H: EXCESSIVE HEAD PRESSURE IN HEATING MODE
Low air flow
See E: Noisy blower and low air flow.
I: AIR COIL FREEZES OVER IN COOLING MODE
Air flow
See E: Noisy blower and low air flow.
Blower motor
Motor not running or running too slow. Motor tripping off on overload. Check for overheated blower motor
and tripped overload. Replace motor if defective.
Panels
Panels not in place.
Low air flow
See E: Noisy blower and low air flow.
J: WATER DRIPPING FROM UNIT
Unit not level
Level unit.
Condensation drain line plugged
Unplug condensation line.
Water sucking off the air coil in
cooling mode
Too much airflow. Duct work not completely installed. If duct work is not completely installed, finish duct
work. Check static pressure and compare with air flow chart in spec manual under specific models section.
If ductwork is completely installed it may be necessary to reduce CFM.
Water sucking out of the
drain pan
Install an EZ-Trap or P-Trap on the drain outlet so blower cannot suck air back through the drain outlet.
ST Models, 05 Aug 2014G
63
Enertech Global
Section 15: Troubleshooting
O: COMPRESSOR WON’T START
Check for proper
compressor nameplate
voltage.
OK
Does Compressor draw
current when voltage is Yes
applied.
Are the suction &
discharge pressures
balanced.
No
Attempt to restart
the compressor
OK
Check voltage supply
& contactor operation.
OK
No
Check motor
resistance.
(See Note B)
Allow time for
compressor to
balance.
OK
Voltage supply
is too low.
Yes
Allow time for the
protector to reset.
No
Compressor
Connection Block
Is the voltage 197
or higher when the
compressor is trying
to start.
Yes
C
Yes
OK
Recheck Resistance
R
Not
OK
OK
Allow to start the
compressor while
measuring voltage
on the load side of
the contactor.
Not
OK
Is the compressor
hot?
No
Check the wiring,
capacitor & contactor
operation. (See Note A)
Yes
If the compressor
fails to start after
3 attempts, replace
the compressor.
S
Single Phase 208-230
C = Line Winding
R = Run Winding
S = Start Winding
Replace Compressor
A: Check all terminals, wires & connections for loose or burned wires and connections. Check contactor and 24 Volt
coil. Check capacitor connections & check capacitor with capacitor tester.
B: If ohm meter reads 0 (short) resistance from C to S, S to R, R to C or from anyone of one of these terminals to
ground (shorted to ground), compressor is bad.
P: COMPRESSOR WON’T PUMP CHART
Is th e c o m p re sso r
ru n n in g ?
Y es
M e a s u re & re c o rd
th e a m p s , v o lts,
s u c ti o n & d is c h a rg e
p re s s u re .
OK
D o e s th e u n it
h a v e a re frig e ra n t
c h a rg e ?
S h u t th e u n it d o w n &
re v e rse th e p h a sin g
(3 - P h a s e O n ly )
OK
No
No
R e fe r to th e c o m p re s s o r
w o n 't sta rt flo w c h a rt.
Y es
C h e c k & v e rify
th e ru n c a p a c ito r
A d d re frig e ra n t
to th e s y ste m .
OK
If th e c o m p re s s o r
s till w o n 't p u m p
re p la c e c o m p re s s o r.
Enertech Global
64
OK
C h e c k th e o p e ra tio n
o f th e re v e rs in g
v a lv e .
ST Models, 05 Aug 2014G
Section 15: Troubleshooting
Table 12a: Model 024 Operational Data - Cooling Mode
Troubleshooting Data - Cooling Mode, Full Load Operation (Desuperheater Off)*
Model
Entering
Water
Temp.,
DB
deg. F
Entering
Air
Temp.,
DB
deg. F
50
60
024
70
70 - 85
80
90
Air Temp. Drop, deg F
GPM/
ton
Liquid
Line
Press., psi
Suction
Line
Press., psi
Subcooling
Superheat
Water
Temp.
Rise,
deg. F
1.5
209 - 232
122 - 145
19 - 24
16 - 20
23 - 27
2.25
195 - 217
114 - 135
17 - 21
16 - 20
15 - 19
3
182 - 202
106 - 126
12 - 15
18 - 22
11 - 15
1.5
245 - 268
144 - 166
18 - 21
14 - 17
23 - 27
2.25
229 - 250
134 - 156
15 - 18
14 - 17
15 - 19
3
213 - 233
125 - 145
11 - 13
16 - 19
10 - 14
1.5
279 - 302
146 - 169
19 - 22
14 - 17
23 - 27
2.25
261 - 282
136 - 158
17 - 20
14 - 17
14 - 18
3
243 - 263
127 - 147
12 - 14
16 - 19
10 - 14
1.5
338 - 361
153 - 176
21 - 26
12 - 15
22 - 26
2.25
316 - 337
143 - 164
18 - 22
12 - 15
14 - 18
3
294 - 314
133 - 153
13 - 16
14 - 17
10 - 14
1.5
383 - 406
173 - 196
16 - 19
11 - 13
22 - 26
2.25
359 - 380
162 - 184
14 - 17
11 - 13
14 - 18
3
334 - 354
151 - 171
10 - 12
12 - 15
10 - 14
375
CFM/
ton
400
CFM/
ton
425
CFM/
ton
22 - 26
20 - 24
19 - 23
21 - 25
20 - 24
19 - 23
21 - 25
20 - 24
18 - 22
20 - 24
19 - 23
18 - 22
20 - 24
18 - 22
17 - 21
Table 12b: Model 024 Operational Data - Heating Mode
Troubleshooting Data - Heating Mode, Full Load Operation (Desuperheater Off)*
Model
Entering
Water
Temp.,
DB
deg F
32
024
40
50
Entering
Air
Temp.,
DB
deg F
Liquid
Line
Press., psi
Suction
Line
Press., psi
55
222 - 242
75 - 85
60
240 - 260
76 - 86
65
257 - 277
76 - 86
70
269 - 289
77 - 87
75
277 - 297
77 - 87
55
230 - 250
85 - 95
60
249 - 269
86 - 96
65
267 - 287
86 - 96
70
279 - 299
87 - 97
75
288 - 308
88 - 98
55
244 - 264
106 - 116
60
264 - 284
106 - 116
65
283 - 303
107 - 117
70
296 - 316
108 - 118
75
305 - 325
109 - 119
Water Temp. Drop, deg. F
Air Temp. Rise, deg F
Subcooling
Superheat
1.5
GPM/
ton
2.25
GPM/
ton
3
GPM/
ton
375
CFM/
ton
400
CFM/
ton
425
CFM/
ton
3-5
8 - 10
N/A
5-7
3-5
21 - 25
20 - 24
19 - 23
2-4
9 - 11
N/A
6-8
4-6
25 - 29
23 - 27
21 - 25
2-4
9 - 11
11 - 13
7-9
5-7
28 - 32
26 - 30
24 - 28
* Pressures are for reference only--Do not use for charging. Preferred charging method is using approach temperatures in cooling.
If charging in cooling is not possible, charging in heating may be accomplished using the Subcooling/Superheat values at
appropriate water temperature.
ST Models, 05 Aug 2014G
65
Enertech Global
Section 15: Troubleshooting
Table 12c: Model 036 Operational Data - Cooling Mode
Troubleshooting Data - Cooling Mode, Full Load Operation (Desuperheater Off)*
Model
Entering
Water
Temp.,
DB
deg. F
Entering
Air
Temp.,
DB
deg. F
50
60
036
70
70 - 85
80
90
Air Temp. Drop, deg F
Water
Temp.
Rise,
deg. F
Liquid
Line
Press., psi
Suction
Line
Press., psi
1.5
222 - 245
121 - 144
30 - 37
14 - 17
19 - 23
2.25
207 - 229
113 - 134
27 - 32
14 - 17
12 - 16
GPM/
ton
Subcooling
Superheat
3
193 - 213
105 - 125
19 - 23
16 - 19
9 - 13
1.5
259 - 282
141 - 164
26 - 32
12 - 15
19 - 23
2.25
243 - 264
132 - 154
22 - 28
12 - 15
12 - 16
3
226 - 246
123 - 143
16 - 20
14 - 17
9 - 13
1.5
296 - 319
144 - 166
27 - 32
12 - 14
19 - 23
2.25
277 - 299
134 - 156
24 - 28
12 - 14
12 - 16
3
258 - 278
125 - 145
17 - 20
13 - 16
8 - 12
1.5
357 - 380
150 - 173
27 - 34
10 - 12
18 - 22
2.25
334 - 356
141 - 162
24 - 29
10 - 12
12 - 16
3
311 - 331
131 - 151
17 - 21
11 - 14
8 - 12
1.5
406 - 429
171 - 194
22 - 27
9 - 11
18 - 22
2.25
380 - 402
160 - 182
20 - 24
9 - 11
11 - 15
3
354 - 374
149 - 169
14 - 17
10 - 12
8 - 12
375
CFM/
ton
400
CFM/
ton
425
CFM/
ton
21 - 25
20 - 24
18 - 22
21 - 25
20 - 24
18 - 22
21 - 25
19 - 23
18 - 22
20 - 24
19 - 23
17 - 21
19 - 23
18 - 22
17 - 21
Table 12d: Model 036 Operational Data - Heating Mode
Troubleshooting Data - Heating Mode, Full Load Operation (Desuperheater Off)*
Model
Entering
Water
Temp.,
DB
deg F
Entering
Air
Temp.,
DB
deg F
Liquid
Line
Press., psi
Suction
Line
Press., psi
55
241 - 261
74 - 84
60
260 - 280
75 - 85
65
278 - 298
76 - 86
70
289 - 309
77 - 87
75
297 - 317
77 - 87
32
036
40
50
55
247 - 267
94 - 104
60
266 - 286
96 - 106
65
285 - 305
97 - 107
70
296 - 316
98 - 108
75
304 - 324
98 - 108
55
268 - 288
106 - 116
60
289 - 309
107 - 117
65
309 - 329
109 - 119
70
321 - 341
110 - 120
75
330 - 350
110 - 120
Water Temp. Drop, deg. F
Air Temp. Rise, deg F
Subcooling
Superheat
1.5
GPM/
ton
2.25
GPM/
ton
3
GPM/
ton
375
CFM/
ton
400
CFM/
ton
425
CFM/
ton
7-9
5-7
N/A
5-7
3-5
21 - 25
20 - 24
19 - 23
7-9
5-7
N/A
6-8
4-6
25 - 29
23 - 27
21 - 25
7-9
5-7
11 - 13
7-9
5-7
28 - 32
26 - 30
24 - 28
* Pressures are for reference only--Do not use for charging. Preferred charging method is using approach temperatures in cooling.
If charging in cooling is not possible, charging in heating may be accomplished using the Subcooling/Superheat values at
appropriate water temperature.
Enertech Global
66
ST Models, 05 Aug 2014G
Section 15: Troubleshooting
Table 12e: Model 048 Operational Data - Cooling Mode
Troubleshooting Data - Cooling Mode, Full Load Operation (Desuperheater Off)*
Model
Entering
Water
Temp.,
DB
deg. F
Entering
Air
Temp.,
DB
deg. F
50
60
048
70
70 - 85
80
90
Air Temp. Drop, deg F
Water
Temp.
Rise,
deg. F
Liquid
Line
Press., psi
Suction
Line
Press., psi
1.5
211 - 234
126 - 149
14 - 16
10 - 12
20 - 24
2.25
198 - 219
118 - 140
13 - 14
10 - 12
12 - 16
GPM/
ton
Subcooling
Superheat
3
184 - 204
110 - 130
9 - 10
11 - 13
9 - 13
1.5
247 - 270
148 - 171
11 - 14
8 - 10
20 - 24
2.25
231 - 252
139 - 160
10 - 13
8 - 10
12 - 16
3
215 - 235
129 - 149
7-9
9 - 11
9 - 13
1.5
281 - 304
150 - 173
14 - 18
8 - 10
19 - 23
2.25
263 - 285
141 - 162
13 - 15
8 - 10
12 - 16
3
245 - 265
131 - 151
9 - 11
9 - 11
9 - 13
1.5
339 - 362
157 - 180
16 - 19
6-8
19 - 23
2.25
317 - 338
147 - 169
14 - 17
6-8
12 - 16
3
295 - 315
137 - 157
10 - 12
7-9
8 - 12
1.5
385 - 408
179 - 202
13 - 16
5-7
18 - 22
2.25
360 - 381
168 - 189
11 - 14
5-7
11 - 15
3
335 - 355
156 - 176
8 - 10
6-8
8 - 12
375
CFM/
ton
400
CFM/
ton
425
CFM/
ton
22 - 26
21 - 25
20 - 24
22 - 26
21 - 25
19 - 23
22 - 26
20 - 24
19 - 23
21 - 25
20 - 24
18 - 22
20 - 24
19 - 23
18 - 22
Table 12f: Model 048 Operational Data - Heating Mode
Troubleshooting Data - Heating Mode, Full Load Operation (Desuperheater Off)*
Model
Entering
Water
Temp.,
DB
deg F
32
048
40
50
Entering
Air
Temp.,
DB
deg F
Liquid
Line
Press., psi
Suction
Line
Press., psi
55
232 - 252
75 - 85
60
248 - 268
76 - 86
65
265 - 285
77 - 87
70
276 - 296
78 - 88
75
284 - 304
79 - 89
55
240 - 260
87 - 97
60
258 - 278
88 - 98
65
275 - 295
89 - 99
70
286 - 306
90 - 100
75
294 - 314
91 - 101
55
255 - 275
102 - 112
60
274 - 294
103 - 113
65
292 - 312
104 - 114
70
304 - 324
105 - 115
75
312 - 332
106 - 116
Water Temp. Drop, deg. F
Air Temp. Rise, deg F
Subcooling
Superheat
1.5
GPM/
ton
2.25
GPM/
ton
3
GPM/
ton
375
CFM/
ton
400
CFM/
ton
425
CFM/
ton
4-6
6-8
N/A
5-7
4-6
21 - 25
20 - 24
19 - 23
4-6
7-9
N/A
6-8
4-6
24 - 28
23 - 27
21 - 25
4-6
9 - 11
10 - 12
7-9
5-7
27 - 31
25 - 29
24 - 28
* Pressures are for reference only--Do not use for charging. Preferred charging method is using approach temperatures in cooling.
If charging in cooling is not possible, charging in heating may be accomplished using the Subcooling/Superheat values at
appropriate water temperature.
ST Models, 05 Aug 2014G
67
Enertech Global
Section 15: Troubleshooting
Table 12g: Model 060 Operational Data - Cooling Mode
Troubleshooting Data - Cooling Mode, Full Load Operation (Desuperheater Off)*
Model
Entering
Water
Temp.,
DB
deg. F
Entering
Air
Temp.,
DB
deg. F
50
60
060
70
70 - 85
80
90
Air Temp. Drop, deg F
GPM/
ton
Liquid
Line
Press., psi
Suction
Line
Press., psi
Subcooling
Superheat
Water
Temp.
Rise,
deg. F
1.5
215 - 238
119 - 142
19 - 24
14 - 18
19 - 23
2.25
201 - 222
112 - 133
17 - 21
14 - 18
12 - 16
3
187 - 207
104 - 124
12 - 15
16 - 20
9 - 13
1.5
251 - 274
140 - 163
16 - 19
12 - 15
19 - 23
2.25
235 - 257
131 - 153
14 - 17
12 - 15
12 - 16
3
219 - 239
122 - 142
10 - 12
14 - 17
9 - 13
1.5
287 - 310
142 - 165
18 - 22
12 - 14
19 - 23
2.25
269 - 290
133 - 155
15 - 20
12 - 14
12 - 16
3
250 - 270
124 - 144
11 - 14
13 - 16
8 - 12
1.5
346 - 369
150 - 173
21 - 24
10 - 12
18 - 22
2.25
323 - 345
141 - 162
18 - 21
10 - 12
12 - 16
3
301 - 321
131 - 151
13 - 15
11 - 13
8 - 12
1.5
393 - 416
171 - 194
16 - 19
9 - 11
18 - 22
2.25
367 - 389
160 - 182
14 - 17
9 - 11
11 - 15
3
342 - 362
149 - 169
10 - 12
10 - 12
8 - 12
375
CFM/
ton
400
CFM/
ton
425
CFM/
ton
22 - 26
20 - 24
19 - 23
21 - 25
20 - 24
18 - 22
21 - 25
19 - 23
18 - 22
20 - 24
19 - 23
18 - 22
19 - 23
18 - 22
17 - 21
Table 12h: Model 060 Operational Data - Heating Mode
Troubleshooting Data - Heating Mode, Full Load Operation (Desuperheater Off)*
Model
Entering
Water
Temp.,
DB
deg F
Entering
Air
Temp.,
DB
deg F
Liquid
Line
Press., psi
Suction
Line
Press., psi
55
241 - 261
73 - 83
60
258 - 278
74 - 84
65
275 - 295
75 - 85
70
286 - 306
76 - 86
75
294 - 314
76 - 86
32
060
40
50
55
253 - 273
86 - 96
60
271 - 291
87 - 97
65
289 - 309
88 - 98
70
300 - 320
89 - 99
75
308 - 328
89 - 99
55
268 - 288
102 - 112
60
287 - 307
104 - 114
65
306 - 326
105 - 115
70
318 - 338
106 - 116
75
326 - 346
106 - 116
Water Temp. Drop, deg. F
Air Temp. Rise, deg F
Subcooling
Superheat
1.5
GPM/
ton
2.25
GPM/
ton
3
GPM/
ton
375
CFM/
ton
400
CFM/
ton
425
CFM/
ton
2-4
4-6
N/A
5-7
3-5
20 - 24
19 - 23
18 - 22
3-5
5-7
N/A
6-8
4-6
23 - 27
22 - 26
20 - 24
6-8
5-7
10 - 12
6-8
5-7
26 - 30
24 - 28
23 - 27
* Pressures are for reference only--Do not use for charging. Preferred charging method is using approach temperatures in cooling.
If charging in cooling is not possible, charging in heating may be accomplished using the Subcooling/Superheat values at
appropriate water temperature.
Enertech Global
68
ST Models, 05 Aug 2014G
Section 15: Troubleshooting
Table 12i: Model 072 Operational Data - Cooling Mode
Troubleshooting Data - Cooling Mode, Full Load Operation (Desuperheater Off)*
Model
Entering
Water
Temp.,
DB
deg. F
Entering
Air
Temp.,
DB
deg. F
50
60
072
70
70 - 85
80
90
GPM/
ton
Liquid
Line
Press., psi
Suction
Line
Press., psi
Subcooling
Superheat
Water
Temp.
Rise,
deg. F
Air Temp. Drop, deg F
1.5
209 - 232
113 - 135
11 - 14
22 - 28
18 - 22
2.25
195 - 217
105 - 127
10 - 13
22 - 28
11 - 15
3
182 - 202
98 - 118
7-9
25 - 31
8 - 12
1.5
245 - 268
132 - 155
10 - 11
19 - 23
18 - 22
2.25
229 - 250
124 - 145
8 - 10
19 - 23
11 - 15
3
213 - 233
115 - 135
6-7
21 - 26
8 - 12
1.5
279 - 302
137 - 160
10 - 11
17 - 20
17 - 21
2.25
261 - 282
128 - 149
8 - 10
17 - 20
11 - 15
3
243 - 263
119 - 139
6-7
19 - 23
8 - 12
1.5
333 - 356
145 - 168
10 - 11
13 - 16
17 - 21
2.25
311 - 333
135 - 157
8 - 10
13 - 16
11 - 15
3
290 - 310
126 - 146
6-7
15 - 18
7 - 11
1.5
378 - 401
165 - 188
6-8
12 - 14
17 - 21
2.25
353 - 375
155 - 176
6-7
12 - 14
10 - 14
3
329 - 349
144 - 164
4-5
13 - 16
7 - 11
375
CFM/
ton
400
CFM/
ton
425
CFM/
ton
19 - 23
18 - 22
17 - 21
19 - 23
17 - 21
16 - 20
18 - 22
17 - 21
16 - 20
18 - 22
17 - 21
16 - 20
17 - 21
16 - 20
15 - 19
Table 12j: Model 072 Operational Data - Heating Mode
Troubleshooting Data - Heating Mode, Full Load Operation (Desuperheater Off)*
Model
Entering
Water
Temp.,
DB
deg F
32
072
40
50
Entering
Air
Temp.,
DB
deg F
Liquid
Line
Press., psi
Suction
Line
Press., psi
55
248 - 268
72 - 82
60
265 - 285
73 - 83
65
288 - 308
75 - 85
70
295 - 315
75 - 85
75
305 - 325
76 - 86
55
261 - 281
84 - 94
60
279 - 299
85 - 95
65
302 - 322
87 - 97
70
310 - 330
87 - 97
75
320 - 340
88 - 98
55
276 - 296
99 - 109
60
295 - 315
100 - 110
65
320 - 340
101 - 111
70
328 - 348
102 - 112
75
339 - 359
103 - 113
Water Temp. Drop, deg. F
Air Temp. Rise, deg F
Subcooling
Superheat
1.5
GPM/
ton
2.25
GPM/
ton
3
GPM/
ton
375
CFM/
ton
400
CFM/
ton
425
CFM/
ton
5-7
4-6
N/A
5-7
3-5
20 - 24
18 - 22
17 - 21
6-8
9 - 11
N/A
5-7
4-6
23 - 27
21 - 25
20 - 24
8 - 10
10 - 12
10 - 12
6-8
4-6
25 - 29
23 - 27
22 - 26
* Pressures are for reference only--Do not use for charging. Preferred charging method is using approach temperatures in cooling.
If charging in cooling is not possible, charging in heating may be accomplished using the Subcooling/Superheat values at
appropriate water temperature.
ST Models, 05 Aug 2014G
69
Enertech Global
Section 15: Troubleshooting
Table 13: Refrigeration Troubleshooting
Mode
Discharge
Pressure
Suction
Pressure
Superheat
Subcooling
Air TD
Water TD
Compressor
Amps
Heat
Low
Low
High
Low
Low
Low
Low
Cool
Low
Low
High
Low
Low
Low
Low
Heat
High
High/Normal
Normal
High
High
Normal
High
Cool
High
High/Normal
Normal
High
Normal
High
High
Heat
High
High/Normal
Normal
High/Normal
High
Low
High
Cool
Low
Low/Normal
Low
Normal
High
Low
High/Normal
Low Source
Water Flow
Heat
Low
Low/Normal
Low
Normal
High
Low
High/Normal
Cool
High
High/Normal
Normal
High/Normal
High
Low
High
Low Load
Water Flow
Heat
High
High/Normal
Normal
High/Normal
High
Low
High
Cool
Low
Low/Normal
Low
Normal
High
Low
High/Normal
Heat
High
Low
High
High
Low
Low
Low
Cool
High
Low
High
High
Low
Low
Low
Heat
Low
High/Normal
Low
Low
Low
Low
High
Cool
Low
High/Normal
Low
Low
Low
Low
High
Heat
Low
High
High/Normal
Low/Normal
Low
Low
Low
Cool
Low
High
High/Normal
Low/Normal
Low
Low
Low
System Faults
Under Charge
Over Charge
Low Air Flow
Restricted TXV
TXV Stuck Open
Inadequate
Compression
Enertech Global
70
ST Models, 05 Aug 2014G
Section 16: Forms - Troubleshooting
Customer/Job Name:____________________________________________ Date:________________________________
Model #:__________________________________________ Serial #:____________________________________________
HE or HR = GPM x TD x Fluid Factor
(Use 500 for water; 485 for antifreeze)
Antifreeze Type:____________________________________
SH = Suction Temp. - Suction Sat.
SC = Disch. Sat. - Liq. Line Temp.
Air Handler
Common liquid line
To suction line bulb
To suction line bulb
Filter Drier
To suction line
Air Coil
Htg TXV
psi
°F
Suction Line (saturation)
°F
Suction temp
°F
Supply Air
Line set
Condenser (heating)
Evaporator (cooling)
psi
°F
Discharge Line (saturation)
Reversing
Valve
°F
Coax
Suction
Air Coil
Coax
Heating
Mode
Suction
Discharge
Air Coil
Cut along this line
°F
Return Air
To suction line
IN
IN
Clg TXV
Compressor Section
°F
Optional desuperheater
installed in discharge line
(always disconnect during
troubleshooting)
Cooling
Mode
psi
Source (loop) IN
Suction
GPM
Discharge
Condenser (cooling)
Evaporator (heating)
Source
Coax
Discharge
°F
psi
Source (loop) OUT
ST Models, 05 Aug 2014G
71
Enertech Global
Enertech Global
72
ST Models, 05 Aug 2014G
EQUIPMENT START-UP FORM
Customer Name:_________________________________________________________________
Customer Address:_____________________________________________________________________________________
Model #:__________________________________________ Serial #:____________________________________________
Dealer Name:__________________________________________________________________________________________
Distributor Name:_____________________________________________ Start-up Date:____________________________
Loop Type: Open Closed (Circle One)
Flow Rate
Cooling
Heating
ut alothis
ng tline
his line
CutC
along
Source Water Pressure In
Source Water Pressure Out
Source Water Pressure Drop
Flow Rate
*Check pressure drop chart for GPM
PSI
PSI
PSI
GPM
Unit Electrical Data
PSI
PSI
PSI
GPM
Line Voltage
Total Unit Amps
Compressor Amps
Wire Size
Circuit Breaker Size
Source Water Temp. Difference
Cooling
Heating
Heat of Rejection/Extraction
Cooling
Heating
Source Water Temperature In
Source Water Temperature Out
Source Water Temperature Difference
Heat of Rejection
Heat Of Extraction
ºF
ºF
ºF
BTU/HR
Cooling
V
A
A
GA
A
Heating
A
A
ºF
ºF
ºF
BTU/HR
Heat of Extraction/Rejection = GPM X Water Temp. Difference X 500 (Water - Open Loop)
Heat of Extraction/Rejection = GPM X Water Temp. Difference X 485 (Water & Antifreeze - Closed Loop)
Load Water Temp. Difference
Load Water Temperature In
Load Water Temperature Out
Load Water Temperature Difference
Air Temperature Difference
Cooling
ºF
ºF
ºF
Cooling
Supply Air Temperature
ºF
ºF
Return Air Temperature
ºF
Air Temp. Difference
*Confirm auxiliary heaters are de-energized for the above readings.
Heating
ºF
ºF
ºF
Heating
Auxiliary Heat Operation Only
Heating
Auxiliary Heat Electrical Data
Heating
Supply Air Temperature
Return Air Temperature
Air Temp. Difference
Line Voltage
Total Amperage (Full kW - All Stages)
Wire Size
Breaker Size
CFM = (Watts X 3.413) ÷ (Air Temp. Difference X 1.08)
Watts = Volts X Auxiliary Heater Amps
ºF
ºF
ºF
ºF
ºF
ºF
V
A
GA
A
Installer/Technician:____________________________________________ Date:________________________
Equipment Start-Up Process
Check the following before power is applied to the equipment
Caution: Do not start-up the unit until the new structure is ready to be occupied
Electrical:
… Geothermal unit high voltage
wiring is installed correctly
… Geothermal unit high voltage
wiring and breaker are the correct
size
… Auxiliary electric heaters are
wired and installed correctly
… Circulating pumps are wired and
fused (if necessary) correctly
… Desuperheater pump is NOT
wired, unless piping is complete
and all air is purged
… Low voltage wiring is correct and
completely installed
Plumbing:
… Pipe and pump sizes are correct
… Air is purged from all lines
… Antifreeze is installed
… All valves are open, including
those on the flow center
… Condensate is trapped and piped
to the drain
Ductwork:
… Filter is installed and clean
… Packaging is removed from the
blower assembly
… Blower turns freely
… Canvas connections installed on
supply plenum & return drop
Equipment Start-Up
1. Energize geothermal unit with
high voltage.
2. Set the thermostat to “Heat” or
“Cool.” Adjust set point to
energize the unit. System will
energize after delays expire
(typically a five minute delay).
3. Check water flow with a flow
meter (non-pressurized) or
pressure drop conversion
(pressurized). Pressure drop
tables must be used to convert
the pressure drop to GPM. The
pressure drop can be obtained by
checking water pressure in and
water pressure out at the P/T
ports.
4. Check the geothermal unit’s
electrical readings listed in the
Unit Electrical Data table.
5. Check the source water
temperature in and out at the P/T
ports (use insertion probe). Allow
10 minutes of operation before
recording temperature drop.
6. Calculate the heat of extraction or
heat of rejection.
7. Check the temperature difference
of the load coax (water-to-water)
or air coil (water-to-air). P/T ports
are recommended for use on the
load side, but the line
temperatures can be used to
check the temperature difference.
8. Change the mode of the
thermostat and adjust the set
point to energize the unit. Check
the data in opposite mode as the
previous tests. Amp draws as
well as temperature differences
and flow rate should be recorded.
9. Check auxiliary heat operation by
adjusting the thermostat set point
5°F above the room temperature
in “Heat” mode or set thermostat
to “Emergency." Record voltage,
amperage, and air temperature
difference.
WARRANTY ORDER & CLAIM
PHONE : 618.664.9010 FAX : 618.664.4597 EMAIL : [email protected]
ALL WARRANTY REGISTRATIONS SHOULD BE SUBMITTED WITHIN 10 DAYS OF INSTALLATION
(Form submitter) DATE ___________________
COMPANY NAME ____________________________________________________
PHONE _________________ FAX _________________ EMAIL ________________________________________
ORDERED BY _____________________________________ JOB NAME/PO # ____________________________
UNIT Model # _____________________________________ Serial # ____________________________________
FAILURE DATE ____________________
SHIP TO
HOMEOWNER
ADDRESS
(If different
than
company)
Required if claim is for defective flow center
FLOW CENTER MODEL # ________________________ FLOW CENTER SERIAL # __________________________
FAILURE CODES, DESCRIPTION AND LABOR REIMBURSEMENT
MUST BE FOUND IN WARRANTY MANUAL
FAILURE CODE
DESCRIPTION
PART NUMBER
____________
_________________________________________________
__________
____________
_________________________________________________
__________
____________
_________________________________________________
__________
LABOR REIMBURSEMENT REQUESTED
DO YOU NEED PARTS ORDERED?
NO
(If no, and replacement was purchased from another vendor, attach copy of bill
if reimbursement is needed3.)
YES
NO
YES
____________
____________
OTHER NOTES _______________________________________________________________________________
____________________________________________________________________________________________
FOR ENERTECH COMPANIES USE ONLY
SRO# _________________________________________ CREDIT MEMO# ________________________________
1) See warranty coverage summary sheet for labor allowances, conditions and exclusions, etc. 2) Warranty start date is ship date from Enertech
facility unless proof of startup is presented. 3) Outsourced warranty replacement parts will be reimbursed in the form of credit for the part only.
Credit will be no more than the standard equivalent part cost through Enertech. 4) Factory pre-approval is required for anything outside the scope
of this document. 5) Fuses, hose kits and items not mentioned on Warranty Coverage Summary are not covered under this program.
WARRANTY REGISTRATION
PHONE : 618.664.9010 FAX : 618.664.4597 EMAIL : [email protected]
ALL WARRANTY REGISTRATIONS SHOULD BE SUBMITTED WITHIN 10 DAYS OF INSTALLATION
MODEL NUMBER ___________________ SERIAL NUMBER ____________________ BRAND ________________
DATE OF SALE ________________DELIVERY DATE __________________ INSTALL DATE __________________
APPLICATION
RESIDENTIAL NEW CONSTRUCTION
RESIDENTIAL GEO REPLACEMENT
MULTI-FAMILY (CONDO/TOWNHOME/MULTI-PLEX)
COMMERCIAL
RESIDENTIAL RETROFIT
OTHER ___________________________________
USE
SPACE CONDITIONING
DOMESTIC WATER HEATING
RADIANT HEAT
SWIMMING POOL
SNOW MELT
OTHER ____________________________________________________________________________________________
Note: Check all that apply
SOURCE
CLOSED LOOP (HORIZONTAL, VERTICAL, POND/LAKE)
OPEN LOOP (WELL WATER)
OTHER ______________________
SUPPLEMENTAL / EMERGENCY
NONE
ELECTRIC
GAS
PROPANE
OIL
WOOD
OTHER _______________________________________
PURCHASER-USER ________________________________________________ PHONE ____________________
ADDRESS __________________________________ CITY _________________STATE/PROV ________________
POSTAL CODE _____________ EMAIL (OPTIONAL)_________________________________________________
WE HAVE SUPERVISED THE INSTALLATION AND START-UP IN ACCORDANCE
WITH ENERTECH MANUFACTURING, LLC. INSTALLATION INSTRUCTIONS.
THIS UNIT IS PERFORMING
SATISFACTORILY
NOT SATISFACTORILY, IF NOT EXPLAIN ________________
____________________________________________________________________________________________
TO THE BEST OF MY KNOWLEDGE THE ABOVE INFORMATION IS
ACCURATE AND I REQUEST THE WARRANTY TO BE PUT INTO EFFECT.
DEALER (INSTALLER) ________________________________________________________DATE _____________
CUSTOMER / END USER ______________________________________________________DATE _____________
DEALER (INSTALLER) EMAIL ____________________________________________________________________
MAIL THIS FORM TO:
ENERTECH GLOBAL LLC
2506 SOUTH ELM STREET
GREENVILLE, IL 62246
OR REGISTER ONLINE AT WWW.ENERTECHGEO.COM
FAX THIS FORM TO:
ENERTECH GLOBAL LLC
618.664.4597
Revision Table:
Date
By
Page
Note
05 Aug 2014
GT
14 - 77
Removed all Part Load Extended Data tables
15 July 2014
GT
14-23
Updated CFM ratings on extended data charts, corrected nomenclature drawing
01 July 2014
GT
60
31 July 2013
GT
25 May 2012
DS
51
Added Warning to Desuperheater Installation
20 Jan 2012
DS
All
Added Voltage Code “2”
29 Nov 2011
DS
7
Updated Physical Data
22 Nov 2011
DS
11 Nov 2011
DS
All
Minor Formatting Update
01 Nov 2011
DS
All
First published
Added three Phase Wiring Diagram, Corrected TOC
2, 7, 11 Updated AHRI Data Tables, Added Cased Coil Nomenclature and Dimensions
34 - 36,
Updated charging method, troubleshooting charts
67
MEMBER
⚠ NOTICE ⚠
VERY IMPORTANT WARRANTY
REGISTRATION INFORMATION LOCATED
ON THE BACK COVER.
Enertech Global is continually working to improve its
products. As a result, the pricing, design and specifications
of each product may change without notice and may
not be as described herein. For the most up-to-date
information, please visit our website, or contact our
Customer Service department at [email protected].
Statements and other information contained herein are
not express warranties and do not form the basis of any
bargain between the parties, but are merely Enertech
Global’s opinion or commendation of its products.
© Enertech Global, 2011
ST Models, 05 Aug 2014G
77
Enertech Global
Greenville, IL - Mitchell, SD
[email protected]
MEMBER
Enertech Global is continually working to improve its products. As a result, the design and specifications of each product may
change without notice and may not be as described herein. For the most up-to-date information, please visit our website, or
contact our Customer Service department at [email protected]. Statements and other information contained herein are
not express warranties and do not form the basis of any bargain between the parties, but are merely Enertech Global’s opinion
or commendation of its products.